Low temperature Raman study of the YBa2Cu3Ox (6.44<=x<=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	2014-03-01T01:46:26Z
dc.date.available	2014-03-01T01:46:26Z
dc.date.issued	1997	en
dc.identifier.issn	0921-4534	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/24913
dc.subject.classification	Physics, Applied	en
dc.subject.other	OXYGEN	en
dc.title	Low temperature Raman study of the YBa2Cu3Ox (6.44<=x<=6.98) superconductor.	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1997	en
heal.abstract	Microcrystallites of the series of YBa2Cu3Ox superconductors with oxygen doping in the range 6.44 less than or equal to x less than or equal to 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 (similar to 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.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	PHYSICA C	en
dc.identifier.isi	ISI:A1997XZ90500307	en
dc.identifier.volume	282	en
dc.identifier.spage	1051	en
dc.identifier.epage	1052	en