Raman scattering in MBa2Cu3O7 with M=Y,Eu,andGd: Effect of O18 substitution and oxygen vacancies on the Cu-O vibrational modes

Kourouklis, GA; Jayaraman, A; Batlogg, B; Cava, RJ; Stavola, M; Krol, DM; Rietman, EA; Schneemeyer, LF

dc.contributor.author	Kourouklis, GA	en
dc.contributor.author	Jayaraman, A	en
dc.contributor.author	Batlogg, B	en
dc.contributor.author	Cava, RJ	en
dc.contributor.author	Stavola, M	en
dc.contributor.author	Krol, DM	en
dc.contributor.author	Rietman, EA	en
dc.contributor.author	Schneemeyer, LF	en
dc.date.accessioned	2014-03-01T01:39:14Z
dc.date.available	2014-03-01T01:39:14Z
dc.date.issued	1987	en
dc.identifier.issn	01631829	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/22632
dc.title	Raman scattering in MBa2Cu3O7 with M=Y,Eu,andGd: Effect of O18 substitution and oxygen vacancies on the Cu-O vibrational modes	en
heal.type	journalArticle	en
heal.identifier.primary	10.1103/PhysRevB.36.8320	en
heal.identifier.secondary	http://dx.doi.org/10.1103/PhysRevB.36.8320	en
heal.publicationDate	1987	en
heal.abstract	We have studied the Cu-O vibrations in the MBa2Cu3O7 systems with M=Y,Eu,andGd by Raman spectroscopy. The observed Raman features are similar in the three systems. The four Raman bands in the 300-700 cm-1 frequency region exhibit isotopic shifts upon O18 substitution implying that these modes involve oxygen vibrations. In oxygen-deficient YBa2Cu3O7- samples prepared in the range 0< <0.7 within the orthorhombic structure, the A1g axial stretch mode is found to undergo both a softening and broadening with increasing oxygen deficiency. Furthermore, the Raman feature in the 550-600 cm-1 region shows an increase in intensity. The latter is attributed to disorder activation of the Cu-O chain mode, normally forbidden in the stoichiometric compound. These features and the emergence of a distinct Raman peak near 390 cm-1 in oxygen-deficient samples suggest that Raman spectroscopy could be used for characterizing oxygen stoichiometry of high-Tc superconductors. © 1987 The American Physical Society.	en
heal.journalName	Physical Review B	en
dc.identifier.doi	10.1103/PhysRevB.36.8320	en
dc.identifier.volume	36	en
dc.identifier.issue	16	en
dc.identifier.spage	8320	en
dc.identifier.epage	8324	en