Phonon dispersion in superionic copper selenide - observation of soft phonon modes in superionic phase transition

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dc.contributor.authorDanilkin, SAen_AU
dc.contributor.authorYethiraj, Men_AU
dc.contributor.authorKearley, GJen_AU
dc.date.accessioned2010-07-12T03:24:09Zen_AU
dc.date.available2010-07-12T03:24:09Zen_AU
dc.date.issued2010-03-01en_AU
dc.date.statistics2010-03-01en_AU
dc.description.abstractThis paper reports lattice dynamical measurements of Cu1.8Se superionic conductor in the superionic α-phase at ambient temperature. Measurements of phonon dispersion curves were performed with the new triple-axis spectrometer, TAIPAN, at the OPAL reactor. We found that TA [100], TA [111] and TA1 [110] phonon branches demonstrate a decrease in frequency at wavevectors q > 0.5 rather than the flattening observed previously. Results are compared with calculated density functional theoretical calculations showing the presence of unstable soft mode related to ordering of Cu atoms observed in Cu1.8Se at room temperature followed by α–β phase transition at a lower temperature. Superstructure arising from the ordering causes effects similar to the folding of the Brillouin zone, although phonon intensities at new Brillouin zone centres are weak. The coupling of low-energy phonon modes with displacement of mobile ions can explain the strong damping of phonons at q > 0.5 observed in the experiment. © 2010 The Physical Society of Japanen_AU
dc.identifier.citationDanilkin, S. A., Yethiraj, M., & Kearley, G. J. (2010). Phonon dispersion in superionic copper selenide - observation of soft phonon modes in superionic phase transition. Paper presented to the 3rd International Conference on Physics of Solid State Ionics, ICPSSI-3, 25th – 28th October 2009. Kumamoto University: Japan. In Journal of the Physical Society of Japan, 79(Suppl. A), 25-28. doi:10.1143/JPSJS.79SA.25en_AU
dc.identifier.conferenceenddate28 October 2009en_AU
dc.identifier.conferencename3rd International Conference on Physics of Solid State Ionics, ICPSSI-3en_AU
dc.identifier.conferenceplaceKumamoto, Japanen_AU
dc.identifier.conferencestartdate25 October 2009en_AU
dc.identifier.govdoc1881en_AU
dc.identifier.issn0031-9015en_AU
dc.identifier.issueSAen_AU
dc.identifier.journaltitleJournal of the Physical Society of Japanen_AU
dc.identifier.pagination25-28en_AU
dc.identifier.urihttps://doi.org/10.1143/JPSJS.79SA.25en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1781en_AU
dc.identifier.volume29en_AU
dc.language.isoenen_AU
dc.publisherPhysical Society of Japanen_AU
dc.subjectPhononsen_AU
dc.subjectCopper selenidesen_AU
dc.subjectDispersionsen_AU
dc.subjectOPAL Reactoren_AU
dc.subjectPhase transformationsen_AU
dc.subjectBrillouin zonesen_AU
dc.titlePhonon dispersion in superionic copper selenide - observation of soft phonon modes in superionic phase transitionen_AU
dc.typeConference Paperen_AU
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