Raman spectroscopic study of the La(0.5)R(0.5)Ba(2)Cu(3)O(y) (R=Y, rare earth) superconductors

Palles, D; Poulakis, N; Liarokapis, E; Gantis, A; Calamiotou, M; Koufoudakis, A

dc.contributor.author	Palles, D	en
dc.contributor.author	Poulakis, N	en
dc.contributor.author	Liarokapis, E	en
dc.contributor.author	Gantis, A	en
dc.contributor.author	Calamiotou, M	en
dc.contributor.author	Koufoudakis, A	en
dc.date.accessioned	2014-03-01T01:46:32Z
dc.date.available	2014-03-01T01:46:32Z
dc.date.issued	1997	en
dc.identifier.issn	0749-6036	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/24933
dc.subject	superconductivity	en
dc.subject	Raman scattering	en
dc.subject.classification	Physics, Condensed Matter	en
dc.title	Raman spectroscopic study of the La(0.5)R(0.5)Ba(2)Cu(3)O(y) (R=Y, rare earth) superconductors	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1997	en
heal.abstract	Two series of materials La(0.5)R(0.5)Ba(2)Cu(3)O(y) (fully oxygenated and deoxygenated, R = Pr, Nd, Sm, Eu, Gd, Dy, Y, Ho, Er, Tm, Yb, Lu) have been prepared with a variation of the solid state reaction technique. X-ray diffraction and Raman measurements have been carried out to study the effect of La substitution for another rare earth. The cell parameters show the usual lanthanide contraction behavior. In the micro-Raman spectra a slight increase of the A(g) mode frequency of the apex oxygen with increasing average La-R ionic radius is observed, while the mode frequencies corresponding to the Ba, Cu(2) (cuprate plane Cu), and the in-phase vibrations of the O(2, 3) (cuprate-plane oxygens) atoms remain practically unaffected. Nevertheless the last show a deviation compared to previous measurements on the R123 samples. On the other hand, the changes induced in the B-lg Raman active mode of O(2, 3) (out-of-phase vibrations), can be attributed to chemically separated phases rich in either La, R or an intermediate phase, The results are discussed in connection with a previously studied Pr(0.5)R(0.5)Ba(2)Cu(3)O(y) series. (C) 1997 Academic Press Limited.	en
heal.publisher	ACADEMIC PRESS LTD	en
heal.journalName	SUPERLATTICES AND MICROSTRUCTURES	en
dc.identifier.isi	ISI:A1997WL70800009	en
dc.identifier.volume	21	en
dc.identifier.issue	3	en
dc.identifier.spage	329	en
dc.identifier.epage	334	en