Raman study of the oxygen anharmonicity in YBa2Cu3Ox (6.4&lt;x&lt;7.0) superconductors

Palles, D; Poulakis, N; Liarokapis, E; Conder, K; Kaldis, E; Muller, KA

dc.contributor.author	Palles, D	en
dc.contributor.author	Poulakis, N	en
dc.contributor.author	Liarokapis, E	en
dc.contributor.author	Conder, K	en
dc.contributor.author	Kaldis, E	en
dc.contributor.author	Muller, KA	en
dc.date.accessioned	2014-03-01T01:44:50Z
dc.date.available	2014-03-01T01:44:50Z
dc.date.issued	1996	en
dc.identifier.issn	01631829	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/24498
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0000818788&partnerID=40&md5=d95e0acdcc583a8a3305ac63a1fde3a7	en
dc.title	Raman study of the oxygen anharmonicity in YBa2Cu3Ox (6.4<x<7.0) superconductors	en
heal.type	journalArticle	en
heal.publicationDate	1996	en
heal.abstract	A systematic Raman study in the visible and the near IR has been carried out on YBa2Cu3Ox samples, with isotopic substitution of 18O for 16O, and for oxygen concentrations in the range x=6.44-6.98. A small but clear deviation from harmonic behavior has been detected for the frequency shift of the in-phase mode and, to a less extent, of the apex mode, relative to the out-of-phase phonon. The deviation increases towards low concentrations of oxygen. A disagreement of the present work for the apical mode, with a previous investigation using IR excitation, is attributed to the contribution of several phases to the apex mode in the underdoped region and the possible IR resonance of the ""ortho-II"" phase.	en
heal.journalName	Physical Review B - Condensed Matter and Materials Physics	en
dc.identifier.volume	54	en
dc.identifier.issue	9	en
dc.identifier.spage	6721	en
dc.identifier.epage	6727	en