Polarised Raman scattering from orthorhombic and tetragonal GdBa2Cu3O7-δ single crystals: New evidence of chains-to-planes charge redistribution

Hadjiev, VG; Iliev, MN; Raptis, C; Kalev, L; Wanklyn, BM

dc.contributor.author	Hadjiev, VG	en
dc.contributor.author	Iliev, MN	en
dc.contributor.author	Raptis, C	en
dc.contributor.author	Kalev, L	en
dc.contributor.author	Wanklyn, BM	en
dc.date.accessioned	2014-03-01T01:08:06Z
dc.date.available	2014-03-01T01:08:06Z
dc.date.issued	1990	en
dc.identifier.issn	09214534	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/10277
dc.subject	Raman Scattering	en
dc.subject	Single Crystal	en
dc.subject.other	Ceramic Materials	en
dc.subject.other	Gadolinium Compounds	en
dc.subject.other	Phonons	en
dc.subject.other	Raman Scattering	en
dc.subject.other	Gadolinium Barium Copper Oxides	en
dc.subject.other	High Temperature Superconductors	en
dc.subject.other	Oxide Superconductors	en
dc.subject.other	Single Crystals	en
dc.subject.other	Superconducting Materials	en
dc.title	Polarised Raman scattering from orthorhombic and tetragonal GdBa2Cu3O7-δ single crystals: New evidence of chains-to-planes charge redistribution	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/0921-4534(90)90399-Y	en
heal.identifier.secondary	http://dx.doi.org/10.1016/0921-4534(90)90399-Y	en
heal.publicationDate	1990	en
heal.abstract	Raman scattering spectra of various polarisation configurations have been obtained from as-grown single crystals of Gd-Ba2Cu3O7-δ in both the orthorhombic (δ≈0.1) and tetragonal (0.7<δ<0.9) phases using the microprobe technique. Apart from the five Ag phonons at 118, 149, 331, 433 and 506 cm-1, two more Raman lines at 205 and 302 cm-1 have been observed in cross-polarisation spectra of the orthorhombic phase exhibiting B2g and B3g symmetries respectively. There was no observation of respective nondiagonal Eg symmetry modes in the tetragonal phase. The changes in the lineshapes and intensities for the same scattering configurations of the orthorhombic and tetragonal phases provide evidence for a strong influence of the free carriers on the scattering process. The experimental results are compatible with the concept of chains-to-planes charge transfer. © 1990.	en
heal.journalName	Physica C: Superconductivity and its applications	en
dc.identifier.doi	10.1016/0921-4534(90)90399-Y	en
dc.identifier.volume	166	en
dc.identifier.issue	3-4	en
dc.identifier.spage	225	en
dc.identifier.epage	230	en