Raman spectroscopy, structural modifications, and phase transitions in the high-temperature superconductors

Liarokapis, E

dc.contributor.author	Liarokapis, E	en
dc.date.accessioned	2014-03-01T01:15:51Z
dc.date.available	2014-03-01T01:15:51Z
dc.date.issued	2000	en
dc.identifier.issn	0896-1107	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13766
dc.subject	Raman spectroscopy	en
dc.subject	phase separation	en
dc.subject	phonons	en
dc.subject	superconductivity superstructures	en
dc.subject.classification	Physics, Applied	en
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	LOCAL-STRUCTURE	en
dc.subject.other	YBA2CU3OX	en
dc.subject.other	SEPARATION	en
dc.subject.other	MODE	en
dc.title	Raman spectroscopy, structural modifications, and phase transitions in the high-temperature superconductors	en
heal.type	journalArticle	en
heal.identifier.primary	10.1023/A:1026470316446	en
heal.identifier.secondary	http://dx.doi.org/10.1023/A:1026470316446	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	The formation of phases is investigated from a systematic study of the Raman active phonons in the whole range of oxygen doping of YBa2Cu3Ox (6 < x < 7). Changes in the spectral characteristics of the in-phase vibrations of the plane oxygen atoms in the overdoped region are related, with slight modifications of the buckling in the CuO2 planes. A softening of the A(g) symmetry apical oxygen phonon is accompanied with an increase in the intensity of the high-frequency mode at similar to 600 cm(-1) and attributed to the breaking of the chains into small segments. The analysis of the apex and the in-phase phonon modes indicates the formation of superstructures, which are embedded as spatially separated phases in the whole oxygen concentration region of 6.35 < x < 6,95. A similar separation into small domains of phases may also occur in the underdoped compounds (x < 6.35) down to a critical oxygen concentration at x <similar to> 6.15, where the system breaks into randomly oriented small chains.	en
heal.publisher	KLUWER ACADEMIC/PLENUM PUBL	en
heal.journalName	JOURNAL OF SUPERCONDUCTIVITY	en
dc.identifier.doi	10.1023/A:1026470316446	en
dc.identifier.isi	ISI:000165569000005	en
dc.identifier.volume	13	en
dc.identifier.issue	6	en
dc.identifier.spage	889	en
dc.identifier.epage	893	en