Hoffmann, Jörg

[["dc.bibliographiccitation.firstpage","2487"],["dc.bibliographiccitation.journal","PHYSICA C"],["dc.bibliographiccitation.lastpage","2488"],["dc.bibliographiccitation.volume","341"],["dc.contributor.author","Vostner, A."],["dc.contributor.author","Weber, H. W."],["dc.contributor.author","Mathen, A."],["dc.contributor.author","Jooss, C."],["dc.contributor.author","Hoffmann, J."],["dc.contributor.author","Freyhardt, Herbert C."],["dc.date.accessioned","2018-11-07T08:47:03Z"],["dc.date.available","2018-11-07T08:47:03Z"],["dc.date.issued","2000"],["dc.description.abstract","Results on the field and temperature dependence of the: critical transport current density in YBa2Cu3O7-delta coated conductors of various thickness are presented. The conductors were deposited by liquid phase epitaxy on RE-123 buffer layers on MgO substrates. The analysis of the remanent fields in magnetization loops with different maximum external field provides information about the inter- and intragrain current distribution. From the reverse leg of the magnetization loops the average grain size in the YBCO layer can be estimated. The results of these magnetic measurements are compared to those obtained from magneto-optical imaging. Modifications of the defect structure by neutron irradiation are reported as well. The resulting defects are either collision cascades, originating from fast neutrons (E > 0.1 MeV), or point defects, originating from neutrons with lower energies. Their influence on J(c) will be discussed."],["dc.identifier.doi","10.1016/S0921-4534(00)01277-6"],["dc.identifier.isi","000165856000169"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/20851"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.publisher.place","Amsterdam"],["dc.relation.conference","International Conference on Materials and Mechanisms of Superconductivity High Temperature Superconductors VI"],["dc.relation.eventlocation","HOUSTON, TEXAS"],["dc.relation.issn","0921-4534"],["dc.title","Characterization of YBCO coated conductors deposited by LPE on MgO substrates"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","033011"],["dc.bibliographiccitation.journal","New Journal of Physics"],["dc.bibliographiccitation.volume","17"],["dc.contributor.author","Scherff, Malte"],["dc.contributor.author","Meyer, B."],["dc.contributor.author","Hoffmann, J."],["dc.contributor.author","Jooss, C."],["dc.contributor.author","Feuchter, Manuel"],["dc.contributor.author","Kamlah, Marc"],["dc.date.accessioned","2018-11-07T09:59:48Z"],["dc.date.available","2018-11-07T09:59:48Z"],["dc.date.issued","2015"],["dc.description.abstract","We report here on the presence of two different nonvolatile resistive switching mechanisms in Pt-Pr0.67Ca0.33MnO3-Pt sandwich structures based on pulsed electrical transport measurements. As a function of pulse length, amplitude and temperature, the devices show two different switching regimes. The first is positive switching (PS) where a high resistance state (HRS) evolves at positive bias at the top electrode in the voltage range of U approximate to 0.5-1.2 V and pulse lengths t(p) approximate to 10(-7) s. In addition, we observe a cross over to negative switching (NS) for U > 1 V and t(p) approximate to 10(-3) s. Here, the HRS evolves at negative bias applied at the top electrode. We present strong evidence that both switching mechanisms take place at the interface between Pr0.67Ca0.33MnO3 and the top electrode. Based on finite element simulations of the temperature evolution during the electrical pulses, we show that the onset of Joule heating is characteristic of the PS regime, whereas drastic temperature increases of several hundred Kelvin evolve during NS. Based on the observed different timescales, pulse amplitudes and temperature dependences of PS and NS, respectively, we suggest that two different switching mechanisms are involved: a fast, short range exchange of oxygen at the interface with the metallic electrode for PS and a slower, long range redistribution of oxygen in the entire PCMO film for the NS."],["dc.description.sponsorship","Open Access Publikationsfonds 2015"],["dc.identifier.doi","10.1088/1367-2630/17/3/033011"],["dc.identifier.isi","000352898500011"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/11865"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/37669"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Iop Publishing Ltd"],["dc.relation.issn","1367-2630"],["dc.relation.orgunit","Fakultät für Physik"],["dc.rights","CC BY 3.0"],["dc.title","Pulse length and amplitude dependent resistive switching mechanisms in Pt-Pr0.67Ca0.33MnO3-Pt sandwich structures"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","243502"],["dc.bibliographiccitation.issue","24"],["dc.bibliographiccitation.journal","Applied Physics Letters"],["dc.bibliographiccitation.volume","110"],["dc.contributor.author","Kramer, Thilo"],["dc.contributor.author","Scherff, Malte"],["dc.contributor.author","Mierwaldt, Daniel"],["dc.contributor.author","Hoffmann, Joerg"],["dc.contributor.author","Jooss, Christian"],["dc.date.accessioned","2018-11-07T10:22:44Z"],["dc.date.available","2018-11-07T10:22:44Z"],["dc.date.issued","2017"],["dc.description.abstract","Non-volatile resistance change under electric stimulation in oxides is a promising path to next generation memory devices. However, the underlying mechanisms are still not fully understood. We report here on the study of switching in Pr0.67Ca0.33MnO3-delta (PCMO) films sandwiched by noble metal Pt electrodes, where electrode oxidation can be excluded. In order to develop an understanding of the switching induced oxygen migration, its initial concentration is modified by post-annealing of the deposited PCMO films. The oxygen distribution is obtained by manganese valence determination using spatially resolved electron energy loss spectroscopy in scanning transmission electron microscopy mode. We observe correlations between virgin state resistance, resistive switching properties, oxygen vacancy distribution, and stress/strain state of the PCMO films and propose a simplified interface resistance model based on the measured valence distribution. It assumes a linear correlation of oxygen vacancy concentration with conductivity and a metal to insulator transition above a critical vacancy concentration threshold. Our results suggest that resistance changes can take place at both interfaces of symmetric devices and only requires small changes in oxygen vacancy concentration. (C) 2017 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/)."],["dc.description.sponsorship","DFG [Jo 348/10-01]"],["dc.identifier.doi","10.1063/1.4985645"],["dc.identifier.isi","000403678300029"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/42329"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation.issn","1077-3118"],["dc.relation.issn","0003-6951"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","Role of oxygen vacancies for resistive switching in noble metal sandwiched Pr0.67Ca0.33MnO3-delta"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","PII S0921-4534(02)00892-4"],["dc.bibliographiccitation.firstpage","723"],["dc.bibliographiccitation.journal","Physica C Superconductivity"],["dc.bibliographiccitation.lastpage","728"],["dc.bibliographiccitation.volume","372"],["dc.contributor.author","Dzick, J."],["dc.contributor.author","Hoffmann, J."],["dc.contributor.author","Sievers, S."],["dc.contributor.author","Kautschor, L. O."],["dc.contributor.author","Freyhardt, Herbert C."],["dc.date.accessioned","2018-11-07T10:17:41Z"],["dc.date.available","2018-11-07T10:17:41Z"],["dc.date.issued","2002"],["dc.description.abstract","For high-current carrying YBa2Cu3O7-x films, biaxially textured yttria-stabilized zirconia (YSZ) films serve as templates. The YSZ layers are textured by an ion-beam-assisted deposition process (IBAD). Our present investigations of the texture evolution indicated a sequence of at least three characteristic growth stages. During an initial stage, wire-textured (011)-oriented grains nucleated. This stage was followed by a transition stage where (DOI)-oriented grains grew epitaxially on (011) grains which were favorably oriented with respect to the assisting beam. During the final stage a growth selection led to an improvement of the in-plane alignment of those (001)-oriented grains with their (111) axis parallel to the assisting beam. Each one of these growth stages was dominated by specific underlying mechanisms which have been identified. Internal film stresses caused by the massive bombardment of the assisting beam might influence the orientation of nuclei. Ion-beam-induced homoepitaxy generated epitaxial relations between nuclei and underlying film layers. Finally, anisotropic sputter rates caused alterations in growth rates of differently oriented grains that led to an overgrowth of misoriented grains. These results will be summarized in the form of a schematic growth model for IBAD-YSZ films. (C) 2002 Elsevier Science B.V. All rights reserved."],["dc.identifier.doi","10.1016/S0921-4534(02)00892-4"],["dc.identifier.isi","000178018800036"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/41278"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.publisher.place","Amsterdam"],["dc.relation.conference","5th European Conference on Applied Superconductivity (EUCAS 2001)"],["dc.relation.eventlocation","TECH UNIV DENMARK, LYNGBY, DENMARK"],["dc.relation.issn","0921-4534"],["dc.title","Ion-beam-assisted texturing of YSZ layers"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

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Padilha, Antonio Claudio"],["dc.contributor.author","Martini Dalpian, Gustavo"],["dc.contributor.author","Reily Rocha, Alexandre"],["dc.contributor.author","Prodromakis, Themistoklis"],["dc.contributor.author","Salaoru, Iulia"],["dc.contributor.author","Khiat, Ali"],["dc.contributor.author","Toumazou, Christopher"],["dc.contributor.author","Gale, Ella M."],["dc.contributor.author","Madhavan, A."],["dc.contributor.author","Adam, G."],["dc.contributor.author","Alibart, F."],["dc.contributor.author","Gao, L."],["dc.contributor.author","Strukov, D. B."],["dc.contributor.author","Wamwangi, D."],["dc.contributor.author","Welnic, W."],["dc.contributor.author","Wuttig, M."],["dc.contributor.author","Gholipour, Behrad"],["dc.contributor.author","Huang, Chung-Che"],["dc.contributor.author","Anastasopoulos, Alexandros"],["dc.contributor.author","Al-Saab, Feras"],["dc.contributor.author","Hayden, Brian E."],["dc.contributor.author","Hewak, Daniel W."],["dc.contributor.author","Lan, Rui"],["dc.contributor.author","Endo, Rie"],["dc.contributor.author","Kuwahara, Masashi"],["dc.contributor.author","Kobayashi, Yoshinao"],["dc.contributor.author","Susa, Masahiro"],["dc.contributor.author","Baumeister, Paul"],["dc.contributor.author","Wortmann, Daniel"],["dc.contributor.author","Blügel, Stefan"],["dc.contributor.author","Mazzarello, Riccardo"],["dc.contributor.author","Li, Yan"],["dc.contributor.author","Zhang, Wei"],["dc.contributor.author","Ronneberger, Ider"],["dc.contributor.author","Simon, Ronnie"],["dc.contributor.author","Gallus, Jens"],["dc.contributor.author","Bessas, Dimitrios"],["dc.contributor.author","Sergueev, Ilya"],["dc.contributor.author","Wille, Hans-Christian"],["dc.contributor.author","Pierre Hermann, Raphaël"],["dc.contributor.author","Luckas, Jennifer"],["dc.contributor.author","Rausch, Pascal"],["dc.contributor.author","Krebs, Daniel"],["dc.contributor.author","Zalden, Peter"],["dc.contributor.author","Boltz, Janika"],["dc.contributor.author","Raty, Jean-Yves"],["dc.contributor.author","Salinga, Martin"],["dc.contributor.author","Longeaud, Christophe"],["dc.contributor.author","Wuttig, Matthias"],["dc.contributor.author","Kim, Haeri"],["dc.contributor.author","Kim, Dong-Wook"],["dc.contributor.author","Phark, Soo-Hyon"],["dc.contributor.author","Hong, Seungbum"],["dc.contributor.author","Park, C."],["dc.contributor.author","Herpers, A."],["dc.contributor.author","Bruchhaus, R."],["dc.contributor.author","Verbeeck, J."],["dc.contributor.author","Egoavil, R."],["dc.contributor.author","Borgatti, F."],["dc.contributor.author","Panaccione, G."],["dc.contributor.author","Offi, F."],["dc.contributor.author","Dittmann, R."],["dc.contributor.author","Clima, Sergiu"],["dc.contributor.author","Sankaran, Kiroubanand"],["dc.contributor.author","Mees, Maarten"],["dc.contributor.author","Yin Chen, Yang"],["dc.contributor.author","Goux, Ludovic"],["dc.contributor.author","Govoreanu, Bogdan"],["dc.contributor.author","Wouters, Dirk J."],["dc.contributor.author","Kittl, Jorge"],["dc.contributor.author","Jurczak, Malgorzata"],["dc.contributor.author","Pourtois, Geoffrey"],["dc.contributor.author","Calka, P."],["dc.contributor.author","Martinez, E."],["dc.contributor.author","Delaye, V."],["dc.contributor.author","Lafond, D."],["dc.contributor.author","Audoit, G."],["dc.contributor.author","Mariolle, D."],["dc.contributor.author","Chevalier, N."],["dc.contributor.author","Grampeix, H."],["dc.contributor.author","Cagli, C."],["dc.contributor.author","Jousseaume, V."],["dc.contributor.author","Guedj, C."],["dc.contributor.author","Shrestha, Pragya"],["dc.contributor.author","Ochia, Adaku"],["dc.contributor.author","Cheung, Kin. P."],["dc.contributor.author","Campbell, Jason"],["dc.contributor.author","Baumgart, Helmut"],["dc.contributor.author","Harris, Gary"],["dc.contributor.author","Scherff, Malte"],["dc.contributor.author","Meyer, Bjoern"],["dc.contributor.author","Scholz, Julius"],["dc.contributor.author","Hoffmann, Joerg"],["dc.contributor.author","Jooss, Christian"],["dc.contributor.author","Xiao, Bo"],["dc.contributor.author","Tada, Tomofumi"],["dc.contributor.author","Gu, Tingkun"],["dc.contributor.author","Tawara, Arihiro"],["dc.contributor.author","Watanabe, Satoshi"],["dc.contributor.author","Young, Tai-Fa"],["dc.contributor.author","Yang, Ya-Liang"],["dc.contributor.author","Chang, Ting-Chang"],["dc.contributor.author","Hsu, Kuang-Ting"],["dc.contributor.author","Chen, Chao-Yu"],["dc.contributor.author","Burkert, A"],["dc.contributor.author","Valov, I."],["dc.contributor.author","Staikov, G."],["dc.contributor.author","Waser, R."],["dc.contributor.author","van den Hurk, Jan"],["dc.contributor.author","Valov, Ilia"],["dc.contributor.author","Waser, Rainer"],["dc.contributor.author","Valov, Ilia"],["dc.contributor.author","Tappertzhofen, Stefan"],["dc.contributor.author","van der Hurk, Jan"],["dc.contributor.author","Waser, Rainer"],["dc.contributor.author","Adam, G."],["dc.contributor.author","Alibart, F."],["dc.contributor.author","Gao, L."],["dc.contributor.author","Hoskins, B."],["dc.contributor.author","Strukov, D. B."],["dc.contributor.author","Jean Yoon, Kyung"],["dc.contributor.author","Ji Song, Seul"],["dc.contributor.author","Kim, Gun Hwan"],["dc.contributor.author","Seok, Jun Yeong"],["dc.contributor.author","Ho Yoon, Jeong"],["dc.contributor.author","Seong Hwang, Cheol"],["dc.contributor.author","Yoon, Jung Ho"],["dc.contributor.author","Yoon, Kyung Jin"],["dc.contributor.author","Shuai, Yao"],["dc.contributor.author","Wu, Chuangui"],["dc.contributor.author","Zhang, Wanli"],["dc.contributor.author","Zhou, Shengqiang"],["dc.contributor.author","Bürger, Danilo"],["dc.contributor.author","Slesazeck, Stefan"],["dc.contributor.author","Mikolajick, Thomas"],["dc.contributor.author","Helm, Manfred"],["dc.contributor.author","Schmidt, Heidemarie"],["dc.contributor.author","Gale, Ella"],["dc.contributor.author","Pearson, David"],["dc.contributor.author","Kitson, Stephen"],["dc.contributor.author","Adamatzky, Andrew"],["dc.contributor.author","Costello, Ben de Lacy"],["dc.contributor.author","Lehtonen, Eero"],["dc.contributor.author","Poikonen, Jussi"],["dc.contributor.author","Laiho, Mika"],["dc.contributor.author","Kanerva, Pentti"],["dc.contributor.author","Lim, Hyungkwang"],["dc.contributor.author","Jang, Ho-won"],["dc.contributor.author","Jeong, Doo Seok"],["dc.contributor.author","Cao, Xun"],["dc.contributor.author","Jiang, Meng"],["dc.contributor.author","Zhang, Feng"],["dc.contributor.author","Liu, Xinjun"],["dc.contributor.author","Jin, Ping"],["dc.contributor.author","Zhang, Kai"],["dc.contributor.author","Tangirala, Madhavi"],["dc.contributor.author","Shrestha, Pragya"],["dc.contributor.author","Baumgart, Helmut"],["dc.contributor.author","Kittiwatanakul, Salinporn"],["dc.contributor.author","Lu, Jiwei"],["dc.contributor.author","Wolf, Stuart"],["dc.contributor.author","Pallem, Venkateswara"],["dc.contributor.author","Dussarrat, Christian"],["dc.contributor.author","Pinto, S."],["dc.contributor.author","Krishna, R."],["dc.contributor.author","Dias, C."],["dc.contributor.author","Pimentel, G."],["dc.contributor.author","Oliveira, G. N. P."],["dc.contributor.author","Teixeira, J. M."],["dc.contributor.author","Aguiar, P."],["dc.contributor.author","Titus, E."],["dc.contributor.author","Gracio, J."],["dc.contributor.author","Ventura, J."],["dc.contributor.author","Araujo, J. P."],["dc.contributor.editor","Heber, Jörg"],["dc.contributor.editor","Schlom, Darrell"],["dc.contributor.editor","Tokura, Yoshinori"],["dc.contributor.editor","Waser, Rainer"],["dc.contributor.editor","Wuttig, Matthias"],["dc.date.accessioned","2021-12-08T12:29:05Z"],["dc.date.available","2021-12-08T12:29:05Z"],["dc.date.issued","2013"],["dc.identifier.doi","10.1002/9783527667703.ch67"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/95954"],["dc.language.iso","en"],["dc.notes.intern","DOI-Import GROB-476"],["dc.publisher","Wiley-VCH Verlag GmbH & Co. KGaA"],["dc.publisher.place","Weinheim, Germany"],["dc.relation.eisbn","9783527667703"],["dc.relation.isbn","9783527411917"],["dc.relation.ispartof","Frontiers in Electronic Materials : \n A Collection of Extended Abstracts of the Nature Conference Frontiers in Electronic Materials, June 17\n th\n to 20\n th\n 2012, Aachen, Germany"],["dc.title","Poster: Memristive Systems"],["dc.type","book_chapter"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1462"],["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","Journal of Materials Research"],["dc.bibliographiccitation.lastpage","1470"],["dc.bibliographiccitation.volume","27"],["dc.contributor.author","Hoffmann, Joerg"],["dc.contributor.author","Schnittger, Sven"],["dc.contributor.author","Norpoth, Jonas"],["dc.contributor.author","Raabe, Stephanie"],["dc.contributor.author","Kramer, Thilo"],["dc.contributor.author","Jooss, Christian"],["dc.date.accessioned","2018-11-07T09:10:03Z"],["dc.date.available","2018-11-07T09:10:03Z"],["dc.date.issued","2012"],["dc.description.abstract","Fabrication of thin film nanocomposites via decomposition and self-assembly from the vapor phase is a promising path for cost-effective fabrication of multifunctional materials. In particular, oxides as a new class of energy materials allow for rich functionalities, e. g., by combining p-and n-doped systems in catalytic or light harvesting units. Combining A-site doped perovskites ABO(3) with CoFe2O4 spinel, we have investigated thin film phase composition and nanocomposite morphology in the pseudobinary system La0.6Sr0.4BO3-CoFe2O4 for B = Fe, Co, and Mn. We observe formation of an epitaxial two-phase nanocomposite for B = Fe, i.e., the coexistence of La0.6Sr0.4FeO3 and CoFe2O4. In contrast, for B = Co or Mn nanocomposites are formed, where perovskite La0.6Sr0.4BO3 solid solutions coexists with Co-rich spinel and periclase phases. We derive conclusions for the preparation of perovskite-spinel nanocomposites with well-designed doping levels."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft [JO 348/8, SFB 602]"],["dc.identifier.doi","10.1557/jmr.2012.84"],["dc.identifier.isi","000304067600006"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/26404"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Cambridge Univ Press"],["dc.relation.issn","0884-2914"],["dc.title","Nanocomposite stability in Fe-, Co-, and Mn-based perovskite/spinel systems"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","063046"],["dc.bibliographiccitation.journal","New Journal of Physics"],["dc.bibliographiccitation.volume","19"],["dc.contributor.author","Ifland, Benedikt"],["dc.contributor.author","Hoffmann, Joerg"],["dc.contributor.author","Kressdorf, Birte"],["dc.contributor.author","Roddatis, Vladimir"],["dc.contributor.author","Seibt, Michael"],["dc.contributor.author","Jooss, Christian"],["dc.date.accessioned","2018-11-07T10:22:28Z"],["dc.date.available","2018-11-07T10:22:28Z"],["dc.date.issued","2017"],["dc.description.abstract","The effect of correlation effects on photovoltaic energy conversion at manganite/titanite heterojunctions is investigated. As a model system we choose a heterostructure consisting of the small polaron absorber Pr0.66Ca0.34MnO3 (PCMO) epitaxially grown on single-crystalline Nb-doped SrTi0.998Nb0.002O3 (STNO) substrates. The high structural and chemical quality of the interfaces is proved by detailed characterization using high-resolution transmission electron microscopy (TEM) and electron energy loss spectroscopy (EELS) studies. Spectrally resolved and temperature-dependent photovoltaic measurements show pronounced contributions of both the Jahn-Teller (JT) excitations and the charge transfer (CT) transitions to the photovoltaic effect at different photon energies. A linear temperature dependence of the open-circuit voltage for an excitation in the PCMO manganite is only observed below the charge-ordering temperature, indicating that the diffusion length of the photocarrier exceeds the size of the space charge region. The photovoltaic response is compared to that of a heterojunction of lightly doped Pr0.05Ca0.95MnO3 (CMO)/STNO, where the JT transition is absent. Here, significant contributions of the CT transition to the photovoltaic effect set in below the Neel temperature. We conclude that polaronic correlations and ordering effects are essentials for photovoltaic energy conversion in manganites."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft (DFG) [SFB1073]"],["dc.description.sponsorship","Open-Access-Publikationsfonds 2017"],["dc.identifier.doi","10.1088/1367-2630/aa6c22"],["dc.identifier.isi","000404761900009"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/14592"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/42283"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area B | B02 Photonen-getriebener Energietransfer über Grenzflächen zwischen Materialien mit starken Korrelationen"],["dc.relation.issn","1367-2630"],["dc.relation.orgunit","Fakultät für Physik"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.rights","CC BY 4.0"],["dc.title","Contribution of Jahn-Teller and charge transfer excitations to the photovoltaic effect of manganite/titanite heterojunctions"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","2002049"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Advanced Materials Interfaces"],["dc.bibliographiccitation.volume","8"],["dc.contributor.author","Hoffmann-Urlaub, Sarah"],["dc.contributor.author","Ross, Ulrich"],["dc.contributor.author","Hoffmann, Jörg"],["dc.contributor.author","Belenchuk, Alexandr"],["dc.contributor.author","Shapoval, Oleg"],["dc.contributor.author","Roddatis, Vladimir"],["dc.contributor.author","Ma, Qian"],["dc.contributor.author","Kressdorf, Birte"],["dc.contributor.author","Moshnyaga, Vasily"],["dc.contributor.author","Jooss, Christian"],["dc.date.accessioned","2021-04-14T08:29:32Z"],["dc.date.available","2021-04-14T08:29:32Z"],["dc.date.issued","2021"],["dc.description.abstract","Abstract Interest in layered Ruddlesden–Popper (RP) strongly correlated manganites of Pr0.5Ca1.5MnO4 as well as in their thin film polymorphs is motivated by the high temperature of charge orbital ordering above room temperature. The c‐axis orientation in epitaxial films is tailored by different SrTiO3 (STO) substrate orientations and CaMnO3 (CMO) buffer layers. Films on STO(110) show in‐plane alignment of the c‐axis parallel to the [100] direction. On STO(100), two possible directions of the in‐plane c‐axis lead to a mosaic like, quasi 2D nanostructure, consisting of RP, rock‐salt, and perovskite blocks. With the CMO buffer layer, Pr0.5Ca1.5MnO4 epitaxial films with c‐axis out‐of‐plane are realized. Different physical vapor deposition techniques as ion beam sputtering, pulsed laser deposition and metalorganic aerosol deposition are applied in order to distinguish effects of growth conditions from intrinsic epitaxial properties. Despite their very different growth conditions, surface morphology, crystal structure, and orientation of the thin films reveal a high level of similarity as verified by X‐ray diffraction, scanning, and high resolution transmission electron microscopy. For different epitaxial relations stress in the films is relaxed by means of modified interface chemistry. The charge ordering in the films occurs at a temperature close to that expected in bulk material."],["dc.description.abstract","The growth direction of a Ruddlesden–Popper Pr0.5Ca1.5MnO4 thin film is governed by its strain state. For different SrTiO3 substrate orientations the unit cells of the film are aligned in parallel or in a perpendicular configuration—forming a mosaic like microstructure. With a CaMnO3 buffer layer the c‐axis can even be tilted to the out‐of‐plane direction. image"],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659"],["dc.identifier.doi","10.1002/admi.202002049"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/82926"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area A | A02 Verständnis und Manipulation von Dissipationskanälen des Energietransports"],["dc.relation","SFB 1073 | Topical Area B | B02 Photonen-getriebener Energietransfer über Grenzflächen zwischen Materialien mit starken Korrelationen"],["dc.relation","SFB 1073 | Topical Area Z | Z02 Hochauflösende Charakterisierung von Grenzflächen"],["dc.relation.eissn","2196-7350"],["dc.relation.issn","2196-7350"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.rights","This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made."],["dc.title","Tailoring c-axis orientation in epitaxial Ruddlesden-Popper Pr0.5Ca1.5MnO4 films"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","103008"],["dc.bibliographiccitation.issue","10"],["dc.bibliographiccitation.journal","New Journal of Physics"],["dc.bibliographiccitation.volume","15"],["dc.contributor.affiliation","Scherff, M;"],["dc.contributor.affiliation","Hoffmann, J;"],["dc.contributor.affiliation","Meyer, B;"],["dc.contributor.affiliation","Danz, Th;"],["dc.contributor.affiliation","Jooss, Ch;"],["dc.contributor.author","Scherff, Malte"],["dc.contributor.author","Hoffmann, J."],["dc.contributor.author","Danz, T. H."],["dc.contributor.author","Jooss, C. H."],["dc.contributor.author","Meyer, B"],["dc.date.accessioned","2018-11-07T09:18:43Z"],["dc.date.available","2018-11-07T09:18:43Z"],["dc.date.issued","2013"],["dc.date.updated","2022-02-10T07:03:55Z"],["dc.description.abstract","The identification of the cross-plane electric transport mechanisms in different resistance states of metal-oxide sandwich structures is essential for gaining insights into the mechanisms of resistive switching (RS). Here, we present a systematic study of cross-plane electric transport properties of Pr0.67Ca0.33MnO3 (PCMO) thin films sandwiched by precious Pt metal electrodes. We observe three different transport regimes: ohmic, nonlinear and RS. The nonlinear regime is associated with colossal magneto-resistance (CMR) and colossal electro-resistance (CER) effects. In contrast to RS, the CMR and CER are volatile resistance effects which persist only during application of strong magnetic or electric fields and they are restricted to low temperatures. At low current densities, the device resistance is dominated by small polaron hopping transport of the PCMO film. At higher electric current densities near the switching threshold, the interface resistance starts to dominate and remarkably also exhibits thermally activated transport properties. Our studies also shed light onto the interplay of colossal resistance effects and RS: at low temperatures, RS can be only induced by reduction of the PCMO resistivity through CMR and CER. This clearly demonstrates the key role of the current density for controlling the amplitude of non-volatile resistive changes. Conversely, the CMR can be used as a probe for the switching induced changes in disorder and correlations. At small switching amplitudes, we observe slight changes in polaron activation energy which can be attributed to changes at the interface. If the switching amplitude exceeds 1000% and more, the CMR effect in the device can be reversibly changed. This indicates persistent changes in electronic or lattice structure of large regions within the PCMO film."],["dc.description.sponsorship","Open-Access-Publikationsfonds 2013"],["dc.description.sponsorship","DFG [JO 348/10-1]"],["dc.identifier.doi","10.1088/1367-2630/15/10/103008"],["dc.identifier.eissn","1367-2630"],["dc.identifier.isi","000325322400001"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/9560"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/28466"],["dc.language.iso","en"],["dc.notes.intern","Merged from goescholar"],["dc.notes.oa","gold"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","IOP Publishing"],["dc.relation.issn","1367-2630"],["dc.relation.orgunit","Fakultät für Physik"],["dc.rights","CC BY 3.0"],["dc.rights.uri","http://creativecommons.org/licenses/by/3.0"],["dc.title","Interplay of cross-plane polaronic transport and resistive switching in Pt-Pr0.67Ca0.33MnO3-Pt heterostructures"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","129"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Catalysts"],["dc.bibliographiccitation.lastpage","145"],["dc.bibliographiccitation.volume","4"],["dc.contributor.author","Mierwaldt, Daniel"],["dc.contributor.author","Mildner, Stephanie"],["dc.contributor.author","Arrigo, Rosa"],["dc.contributor.author","Knop-Gericke, Axel"],["dc.contributor.author","Franke, Emanuel"],["dc.contributor.author","Blumenstein, Andreas"],["dc.contributor.author","Hoffmann, Joerg"],["dc.contributor.author","Jooß, Christian"],["dc.date.accessioned","2018-11-07T09:39:09Z"],["dc.date.available","2018-11-07T09:39:09Z"],["dc.date.issued","2014"],["dc.description.abstract","Studying catalysts in situ is of high interest for understanding their surface structure and electronic states in operation. Herein, we present a study of epitaxial manganite perovskite thin films (Pr1-xCaxMnO3) active for the oxygen evolution reaction (OER) from electro-catalytic water splitting. X-ray absorption near-edge spectroscopy (XANES) at the Mn L- and O K-edges, as well as X-ray photoemission spectroscopy (XPS) of the O 1s and Ca 2p states have been performed in ultra-high vacuum and in water vapor under positive applied bias at room temperature. It is shown that under the oxidizing conditions of the OER a reduced Mn2+ species is generated at the catalyst surface. The Mn valence shift is accompanied by the formation of surface oxygen vacancies. Annealing of the catalysts in O-2 atmosphere at 120 degrees C restores the virgin surfaces."],["dc.description.sponsorship","DFG CRC 1073 project C02"],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft through the CRC 1073 [C02]"],["dc.identifier.doi","10.3390/catal4020129"],["dc.identifier.isi","000339590600004"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/10510"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/33215"],["dc.notes","Financial support by the Deutsche Forschungsgemeinschaft through the CRC 1073 project C02"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.relation","SFB 1073: Kontrolle von Energiewandlung auf atomaren Skalen"],["dc.relation","SFB 1073 | Topical Area C | C02 In situ hochauflösende Untersuchung des aktiven Zustands bei der photo- und elektrochemischen Wasserspaltung"],["dc.relation.issn","2073-4344"],["dc.relation.orgunit","Fakultät für Physik"],["dc.relation.orgunit","Institut für Materialphysik"],["dc.title","In Situ XANES/XPS Investigation of Doped Manganese Perovskite Catalysts"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]