Raman study of the oxygen anharmonicity in YBa2Cu3Ox (6.4<x<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	2014-03-01T01:12:13Z
dc.date.available	2014-03-01T01:12:13Z
dc.date.issued	1996	en
dc.identifier.issn	0163-1829	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/12014
dc.subject	Superconductors	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	HIGH-TC SUPERCONDUCTORS	en
dc.subject.other	APEX OXYGEN	en
dc.subject.other	ORTHO-II	en
dc.subject.other	SUBSTITUTION	en
dc.subject.other	SCATTERING	en
dc.subject.other	MODE	en
dc.title	Raman study of the oxygen anharmonicity in YBa2Cu3Ox (6.4<x<7.0) superconductors	en
heal.type	journalArticle	en
heal.identifier.primary	10.1103/PhysRevB.54.6721	en
heal.identifier.secondary	http://dx.doi.org/10.1103/PhysRevB.54.6721	en
heal.language	English	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 O-18 for O-16, 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.publisher	AMERICAN PHYSICAL SOC	en
heal.journalName	PHYSICAL REVIEW B	en
dc.identifier.doi	10.1103/PhysRevB.54.6721	en
dc.identifier.isi	ISI:A1996VG94900100	en
dc.identifier.volume	54	en
dc.identifier.issue	9	en
dc.identifier.spage	6721	en
dc.identifier.epage	6727	en