Low temperature Raman study of the YBa2Cu3Ox (6.44≤×≤6,98) superconductor

Palles, D; Lampakis, D; Poulakis, N; Conder, K; Kaldis, E; Liarokapis, E

dc.contributor.author	Palles, D	en
dc.contributor.author	Lampakis, D	en
dc.contributor.author	Poulakis, N	en
dc.contributor.author	Conder, K	en
dc.contributor.author	Kaldis, E	en
dc.contributor.author	Liarokapis, E	en
dc.date.accessioned	2014-03-01T01:45:58Z
dc.date.available	2014-03-01T01:45:58Z
dc.date.issued	1997	en
dc.identifier.issn	09214534	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/24819
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0031211035&partnerID=40&md5=ebda164eb194f559d0f56446f0539c63	en
dc.subject.other	Composition effects	en
dc.subject.other	Doping (additives)	en
dc.subject.other	High temperature superconductors	en
dc.subject.other	Nanostructured materials	en
dc.subject.other	Phase transitions	en
dc.subject.other	Phonons	en
dc.subject.other	Raman spectroscopy	en
dc.subject.other	Thermal effects	en
dc.subject.other	Yttrium compounds	en
dc.subject.other	Apical phonons	en
dc.subject.other	Oxide superconductors	en
dc.title	Low temperature Raman study of the YBa2Cu3Ox (6.44≤×≤6,98) superconductor	en
heal.type	journalArticle	en
heal.publicationDate	1997	en
heal.abstract	Microcrystallites of the series of YBa2Cu3Ox superconductors with oxygen doping in the range 6.44≤×≤6.98 have been studied by Raman spectroscopy at low temperatures. The abrupt softening of the O(2,3) in-phase phonon above optimum doping, previously reported at room temperature persists to the lowest temperatures studied (∼5K). The dependence of the linewidth of this mode on the oxygen concentration at low temperatures agrees, in general, with the already known room temperature dependence, except at the optimum doping where the phonon remains very wide, an indication of a phase transition. The temperature dependence of the phonon characteristics of the in-phase plane oxygen mode indicate an anharmonic behaviour which increases with decreasing x, in agreement with previously reported data at room temperature obtained with oxygen isotopic substitution. A similar anharmonicity but to a lesser degree is also observed for the apical phonon.	en
heal.journalName	Physica C: Superconductivity and its Applications	en
dc.identifier.volume	282-287	en
dc.identifier.issue	PART 2	en
dc.identifier.spage	1051	en
dc.identifier.epage	1052	en