Eckold, Götz

[["dc.bibliographiccitation.firstpage","791"],["dc.bibliographiccitation.journal","Physica B Condensed Matter"],["dc.bibliographiccitation.lastpage","794"],["dc.bibliographiccitation.volume","385"],["dc.contributor.author","Islamov, Akhmed Khysainovich"],["dc.contributor.author","Haramagatti, Chandrashekara Rajashekara"],["dc.contributor.author","Gibhardt, Holger"],["dc.contributor.author","Kuklin, Alexander Ivanovich"],["dc.contributor.author","Eckold, Goetz"],["dc.date.accessioned","2018-11-07T08:58:16Z"],["dc.date.available","2018-11-07T08:58:16Z"],["dc.date.issued","2006"],["dc.description.abstract","The crystallization behaviour of micellar solutions of tetradecyl-trimethylammonium-bromide has been investigated in a wide range of temperatures, pressures and electrolyte concentrations using the combination of small-angle neutron scattering and optical Raman scattering. The liquid to solid phase boundary is shifted to higher temperatures and lower pressures by the addition of NaBr. Time-dependent experiments yielded that the kinetics of the transition into the solid phase is rather sluggish and occurs on a time scale of hours. Moreover, intermediate metastable gel phases are observed along with a pronounced hysteresis of the phase transitions. (c) 2006 Elsevier B.V. All rights reserved."],["dc.identifier.doi","10.1016/j.physb.2006.06.085"],["dc.identifier.isi","000243096400234"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/23602"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.publisher.place","Amsterdam"],["dc.relation.conference","8th International Conference (ICNS 2005)"],["dc.relation.eventlocation","Sydney, AUSTRALIA"],["dc.relation.issn","0921-4526"],["dc.title","Pressure-induced phase transitions in micellar solutions"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","015005"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Materials Research Express"],["dc.bibliographiccitation.volume","2"],["dc.contributor.author","Gibhardt, Holger"],["dc.contributor.author","Leist, Jeannis"],["dc.contributor.author","Eckold, Goetz"],["dc.date.accessioned","2018-11-07T10:02:31Z"],["dc.date.available","2018-11-07T10:02:31Z"],["dc.date.issued","2015"],["dc.description.abstract","The domain structure of SrTiO3 below its cubic to tetragonal phase transition depends not only on the stress-state of a particular sample but can also be modified very efficiently by the application of electric fields. Hence, the interpretation of field induced phenomena needs a careful consideration of the domain distribution which is often neglected in existing studies. In this paper, it is shown that the strong variation of polarized Raman spectra under external fields observed within both the para-electric tetragonal phase and the field induced ferroelectric phase, is a direct consequence of the redistribution of domains. Raman data can therefore be used to characterize the domain structure of a particular sample."],["dc.identifier.doi","10.1088/2053-1591/2/1/015005"],["dc.identifier.isi","000369978500005"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38244"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Iop Publishing Ltd"],["dc.relation.issn","2053-1591"],["dc.title","Influence of electric field and domain structure on the low-temperature Raman spectra of SrTiO3"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","6559"],["dc.bibliographiccitation.issue","41"],["dc.bibliographiccitation.journal","Journal of Physics Condensed Matter"],["dc.bibliographiccitation.lastpage","6573"],["dc.bibliographiccitation.volume","17"],["dc.contributor.author","Elter, P."],["dc.contributor.author","Eckold, Goetz"],["dc.contributor.author","Gibhardt, Holger"],["dc.contributor.author","Schmidt, W."],["dc.contributor.author","Hoser, A."],["dc.date.accessioned","2018-11-07T10:54:58Z"],["dc.date.available","2018-11-07T10:54:58Z"],["dc.date.issued","2005"],["dc.description.abstract","Real-time inelastic neutron scattering has been used to study the kinetics of the demixing process in AgBr-NaBr mixed single crystals. The variation of transverse acoustic phonon spectra provides most direct information about the microscopic non-equilibrium behaviour. The phase separation is monitored by a well defined splitting of phonon peaks that reflects the different dynamical behaviours of the constituents. As a function of temperature, time evolution of the phonon spectra changes drastically, thus proving unambiguously that the demixing process is dominated by nucleation in the high-temperature regime and by concentration fluctuations at low temperatures."],["dc.identifier.doi","10.1088/0953-8984/17/41/025"],["dc.identifier.isi","000233589400030"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/49683"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Iop Publishing Ltd"],["dc.relation.issn","0953-8984"],["dc.title","Kinetics of decomposition in ionic solids: IV. Transition between nucleation and spinodal decomposition observed by time-resolved phonon spectroscopy"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","PII S0953-8984(04)79822-7"],["dc.bibliographiccitation.firstpage","5945"],["dc.bibliographiccitation.issue","32"],["dc.bibliographiccitation.journal","Journal of Physics Condensed Matter"],["dc.bibliographiccitation.lastpage","5954"],["dc.bibliographiccitation.volume","16"],["dc.contributor.author","Eckold, Goetz"],["dc.contributor.author","Caspary, D."],["dc.contributor.author","Gibhardt, Holger"],["dc.contributor.author","Schmidt, W."],["dc.contributor.author","Hoser, A."],["dc.date.accessioned","2018-11-07T10:46:22Z"],["dc.date.available","2018-11-07T10:46:22Z"],["dc.date.issued","2004"],["dc.description.abstract","Real-time inelastic neutron scattering has been used to study the kinetics of the demixing process in AgCl-NaCl mixed single crystals. The variation of transverse acoustic phonon spectra provides the most direct information about the microscopic non-equilibrium behaviour. It is shown that a well defined splitting of phonon peaks corresponding to the formation of the product phases takes place on a timescale of seconds. Along with the observation of satellite reflections these findings clearly demonstrate that the phase separation is governed by the mechanism of spinodal decomposition in this ionic system. During the entire process the lattice parameter keeps almost unchanged, thus leading to a metastable state characterized by large coherency strains."],["dc.identifier.doi","10.1088/0953-8984/16/32/027"],["dc.identifier.isi","000223750600033"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/47732"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Iop Publishing Ltd"],["dc.relation.issn","1361-648X"],["dc.relation.issn","0953-8984"],["dc.title","Kinetics of decomposition in ionic solids: III. Time evolution of phonons during spinodal decomposition in AgCl-NaCl"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","240"],["dc.bibliographiccitation.journal","Physica B Condensed Matter"],["dc.bibliographiccitation.lastpage","241"],["dc.bibliographiccitation.volume","276"],["dc.contributor.author","Gibhardt, Holger"],["dc.contributor.author","Eckold, Goetz"],["dc.contributor.author","Guthoff, F."],["dc.date.accessioned","2018-11-07T09:39:40Z"],["dc.date.available","2018-11-07T09:39:40Z"],["dc.date.issued","2000"],["dc.description.abstract","Real-time stroboscopic neutron scattering has been used to investigate the time evolution of the phase transition in quartz Under periodic external stresses relaxation times of the order 1 s are observed and the incommensurate phase exhibits a different stability regime as compared to static conditions. (C) 2000 Elsevier Science B.V. All rights reserved."],["dc.identifier.doi","10.1016/S0921-4526(99)01424-6"],["dc.identifier.isi","000086413000100"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/33335"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Bv"],["dc.publisher.place","Amsterdam"],["dc.relation.conference","2nd European Conference on Neutron Scattering (ECNS 99)"],["dc.relation.eventlocation","BUDAPEST, HUNGARY"],["dc.relation.issn","1873-2135"],["dc.relation.issn","0921-4526"],["dc.title","Kinetics of the stress induced phase transition in quartz by real-time neutron scattering"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","415209"],["dc.bibliographiccitation.issue","41"],["dc.bibliographiccitation.journal","Journal of Physics Condensed Matter"],["dc.bibliographiccitation.volume","20"],["dc.contributor.author","Leist, Jeannis"],["dc.contributor.author","Gibhardt, Holger"],["dc.contributor.author","Hradil, Klaudia"],["dc.contributor.author","Eckold, Goetz"],["dc.date.accessioned","2018-11-07T11:10:02Z"],["dc.date.available","2018-11-07T11:10:02Z"],["dc.date.issued","2008"],["dc.description.abstract","The lock-in transition of K2SeO4 at 93.2 K was studied using high-resolution. gamma-ray diffraction, in situ dielectric measurements and neutron scattering. The phase transition shows a coexistence regime of 1.0 K with clearly resolved incommensurate and commensurate satellite reflections. Within a temperature interval of several K above the lock-in transition, strong third order satellites are observed, indicating a pronounced squaring of the modulation wave. Under the influence of high electric fields an intermediate phase is observed, which is characterized by a diffuse intensity distribution. In addition, the dielectric permittivity exhibits two maxima, indicating the existence of two separate phase transitions. This behaviour is attributed to distortions of the discommensuration lattice and pinning of the discommensurations by accumulated charged defects. It seems to be characteristic for modulated ferroelectrics of the A(2)BX(4) group, since a similar behaviour is also found in isostructural Rb2ZnCl4 and K2ZnCl4. The soft-mode dynamics close to T-c is found to be essentially independent of the electric field and not affected by the discommensuration lattice."],["dc.description.sponsorship","DFG [EC153/2-2]"],["dc.identifier.doi","10.1088/0953-8984/20/41/415209"],["dc.identifier.isi","000259693500016"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/53129"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Iop Publishing Ltd"],["dc.relation.issn","1361-648X"],["dc.relation.issn","0953-8984"],["dc.title","Electric field induced anomalies in ferroelectric K2SeO4"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","305901"],["dc.bibliographiccitation.issue","30"],["dc.bibliographiccitation.journal","Journal of Physics Condensed Matter"],["dc.bibliographiccitation.volume","23"],["dc.contributor.author","Leist, Jeannis"],["dc.contributor.author","Gibhardt, Holger"],["dc.contributor.author","Hradil, Klaudia"],["dc.contributor.author","Eckold, Goetz"],["dc.date.accessioned","2018-11-07T08:53:22Z"],["dc.date.available","2018-11-07T08:53:22Z"],["dc.date.issued","2011"],["dc.description.abstract","The field induced switching process across the ferroelectric lock-in transition in K2SeO4 has been studied on a millisecond timescale using stroboscopic neutron diffraction. The time evolution of both the first and the third order satellites was examined. The time constants are found to vary with temperature between 0.2 and 1.2 ms. This is an order of magnitude faster than in the isostructural Rb2ZnCl4. Moreover, the time dependence of the satellite's linewidth provides information about the evolution of the coherence of the modulated structure."],["dc.description.sponsorship","DFG [EC153/2-2]"],["dc.identifier.doi","10.1088/0953-8984/23/30/305901"],["dc.identifier.isi","000292930800014"],["dc.identifier.pmid","21753240"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/22387"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Iop Publishing Ltd"],["dc.relation.issn","1361-648X"],["dc.relation.issn","0953-8984"],["dc.title","Switching behaviour of modulated ferroelectrics: the kinetics of the field induced lock-in transition in K2SeO4"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1869"],["dc.bibliographiccitation.issue","10-12"],["dc.bibliographiccitation.journal","ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS"],["dc.bibliographiccitation.lastpage","1885"],["dc.bibliographiccitation.volume","229"],["dc.contributor.author","Gibhardt, Holger"],["dc.contributor.author","Haramagatti, Chandrashekara Rajashekara"],["dc.contributor.author","Islamov, Ahmed Kh"],["dc.contributor.author","Ivankov, Oleksandr Igorovych"],["dc.contributor.author","Kuklin, Alexander Ivanovich"],["dc.contributor.author","Eckold, Goetz"],["dc.date.accessioned","2018-11-07T10:02:47Z"],["dc.date.available","2018-11-07T10:02:47Z"],["dc.date.issued","2015"],["dc.description.abstract","The phase behavior of surfactant systems is investigated using alkyltrimethylammonium bromide surfactants with different alkyl chain lengths (dodecyl-, tetradecyl-, hexadecyl- and octadecyl) as model substances. The transitions between micellar solution, gel-phase and crystalline phase are characterized by the combination of Raman spectroscopy and small angle neutron scattering. It is demonstrated that in systems with small surfactant molecules the aqueous solution crystallizes directly on cooling to form hydrated crystals while an intermediate gel phase is observed in long chain systems. The cross-over is found for the hexadecyl- compound where the gel phase appears only at high concentrations."],["dc.description.sponsorship","DFG [GRK782]"],["dc.identifier.doi","10.1515/zpch-2015-0609"],["dc.identifier.isi","000364609000022"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/38299"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Walter De Gruyter Gmbh"],["dc.relation.issn","0942-9352"],["dc.title","Ordering Phenomena in Surfactant Systems: From Micellar Solutions to Gel and Crystalline Phases"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","335901"],["dc.bibliographiccitation.issue","33"],["dc.bibliographiccitation.journal","Journal of Physics Condensed Matter"],["dc.bibliographiccitation.volume","24"],["dc.contributor.author","Dura, L."],["dc.contributor.author","Gibhardt, Holger"],["dc.contributor.author","Leist, Jeannis"],["dc.contributor.author","Becker, P."],["dc.contributor.author","Bohaty, L."],["dc.contributor.author","Eckold, Goetz"],["dc.date.accessioned","2018-11-07T09:07:08Z"],["dc.date.available","2018-11-07T09:07:08Z"],["dc.date.issued","2012"],["dc.description.abstract","Dynamic anomalies have been found in the magnetically ordered phases of multiferroic MnWO4 using polarized Raman scattering. Strong phonon damping is observed for several B-g modes within the ferroelectric phase and has been attributed to spin-phonon interactions. Moreover, a new low frequency excitation was detected near 33 cm(-1) that grows in intensity on cooling into the antiferromagnetic phases. It is argued that this signal is most probably due to a two-magnon process."],["dc.description.sponsorship","DFG [SFB 608]"],["dc.identifier.doi","10.1088/0953-8984/24/33/335901"],["dc.identifier.isi","000306997300016"],["dc.identifier.pmid","22836380"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/25719"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Iop Publishing Ltd"],["dc.relation.issn","0953-8984"],["dc.title","Low frequency excitations in multiferroic MnWO4"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","PII S0257-8972(02)00230-X"],["dc.bibliographiccitation.firstpage","114"],["dc.bibliographiccitation.journal","Surface and Coatings Technology"],["dc.bibliographiccitation.lastpage","119"],["dc.bibliographiccitation.volume","158"],["dc.contributor.author","Gerhards, Inga"],["dc.contributor.author","Ronning, Carsten"],["dc.contributor.author","Vetter, Ulrich"],["dc.contributor.author","Hofsass, H."],["dc.contributor.author","Gibhardt, Holger"],["dc.contributor.author","Eckold, Goetz"],["dc.contributor.author","Li, Q."],["dc.contributor.author","Lee, S. T."],["dc.contributor.author","Huang, Yue-Lin"],["dc.contributor.author","Seibt, M."],["dc.date.accessioned","2018-11-07T10:08:52Z"],["dc.date.available","2018-11-07T10:08:52Z"],["dc.date.issued","2002"],["dc.description.abstract","We investigated the synthesis of metallic nanoparticles during growth of an amorphous carbon matrix using mass selected ion beam deposition of carbon and metal ions. By varying the carbon-to-metal ion ratio, a-C:Cu and a-C:Ag films with metal concentrations between 0 and 50 at.% were grown at room temperature on Si substrates by co-deposition of low energy mass-selected C-12(+), Cu-63(+) and Ag-107,109(+) ions. X-ray diffraction and transmission electron microscopy reveal metal particles with diameters of a few nanometers. The matrix is diamond-like with mainly sp(3)-bonded carbon at low metal concentrations and becomes graphitic for metal concentrations exceeding 10 at.%. Whereas a large fraction of the deposited Cu ions are incorporated into the films, most of the deposited Ag ions have disappeared. The residual Ag accumulates at the surface and at the C/Si interface. Furthermore, the interface roughness of a-C:Ag films on Si is high. These observations are discussed in terms of the stability of small Ag clusters and Ag induced interface reactions. (C) 2002 Elsevier Science B.V. All rights reserved."],["dc.identifier.doi","10.1016/S0257-8972(02)00230-X"],["dc.identifier.isi","000178482100021"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/39554"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Science Sa"],["dc.publisher.place","Lausanne"],["dc.relation.conference","12th International Conference on Surface Modification of Materials by Ion Beams"],["dc.relation.eventlocation","MARBURG, GERMANY"],["dc.relation.issn","0257-8972"],["dc.title","Ion beam synthesis of amorphous carbon thin films containing metallic nanoclusters"],["dc.type","conference_paper"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]