Phase transitions at low oxygen concentration in YBa2Cu3Ox

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

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.date.accessioned	2014-03-01T01:15:47Z
dc.date.available	2014-03-01T01:15:47Z
dc.date.issued	2000	en
dc.identifier.issn	0921-4534	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13736
dc.subject	martensitic phase transformation	en
dc.subject	Room Temperature	en
dc.subject	Phase Transition	en
dc.subject.classification	Physics, Applied	en
dc.subject.other	SEPARATION	en
dc.title	Phase transitions at low oxygen concentration in YBa2Cu3Ox	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0921-4534(00)01233-8	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0921-4534(00)01233-8	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	A micro-Raman systematic spectroscopic study at room temperature has been carried out on YBa2Cu3Ox polycrystalline compounds in the whole range from the antiferromagnetic insulating to the metallic state (6<x<7). The evolution of the spectral characteristics mainly in the y(cc)(y) over bar and the y(xx)(y) over bar scattering configurations was examined on several microcrystallites of each sample as a function of the oxygen content. The O-apex phonon appears sensitive to the local chain oxygen environment as modified with the oxygen content. The behavior of the O-pl in-phase A(g) symmetry phonon in the range 6.00<x<6.40 can be described by steplike changes corresponding to chain superstructure phases, usually separated by miscibility gaps, as has been previously done for 6.40<x<7.00. In analogy to the martensitic phase transformation observed in the underdoped-overdoped separation line, x congruent to6.95, from the sudden frequency shift of the O-pl in-phase phonon, there appears a phase transition in the range 6.10<x<6.15, the existence of which is additionally supported by the behavior of other phonons.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	PHYSICA C	en
dc.identifier.doi	10.1016/S0921-4534(00)01233-8	en
dc.identifier.isi	ISI:000165856000039	en
dc.identifier.volume	341	en
dc.identifier.spage	2163	en
dc.identifier.epage	2164	en