Raman spectroscopic study of the La0.5R0.5Ba2Cu3Oy (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	2014-03-01T01:46:06Z
dc.date.available	2014-03-01T01:46:06Z
dc.date.issued	1997	en
dc.identifier.issn	07496036	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/24853
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0030644604&partnerID=40&md5=cd19e3a5df9591e5ad4ba9fc0c4e12bc	en
dc.subject	Raman scattering	en
dc.subject	Superconductivity	en
dc.subject.other	Lanthanum	en
dc.subject.other	Raman scattering	en
dc.subject.other	Raman spectroscopy	en
dc.subject.other	Rare earths	en
dc.subject.other	Substitution reactions	en
dc.subject.other	Superconductivity	en
dc.subject.other	X ray diffraction	en
dc.subject.other	Apex oxygen	en
dc.subject.other	Lanthanide contraction behavior	en
dc.subject.other	Lanthanum rare earth barium copper oxide	en
dc.subject.other	Raman active mode	en
dc.subject.other	Solid state reaction technique	en
dc.subject.other	Oxide superconductors	en
dc.title	Raman spectroscopic study of the La0.5R0.5Ba2Cu3Oy (R = y, rare earth) superconductors	en
heal.type	journalArticle	en
heal.publicationDate	1997	en
heal.abstract	Two series of materials La0.5R0.5Ba2Cu3Oy (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 Ag 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 B1g 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 Pr0.5Ba2Cu3Oy series.	en
heal.journalName	Superlattices and Microstructures	en
dc.identifier.volume	21	en
dc.identifier.issue	3	en
dc.identifier.spage	329	en
dc.identifier.epage	334	en