Phase transitions and Raman spectra correlations in La2-xSrxCuO4(0.0 <= x <= 0.45)

Lampakis, D; Palles, D; Liarokapis, E; Panagopoulos, C; Cooper, JR; Ehrenberg, H; Hartmann, T

dc.contributor.author	Lampakis, D	en
dc.contributor.author	Palles, D	en
dc.contributor.author	Liarokapis, E	en
dc.contributor.author	Panagopoulos, C	en
dc.contributor.author	Cooper, JR	en
dc.contributor.author	Ehrenberg, H	en
dc.contributor.author	Hartmann, T	en
dc.date.accessioned	2014-03-01T01:50:06Z
dc.date.available	2014-03-01T01:50:06Z
dc.date.issued	2000	en
dc.identifier.issn	0163-1829	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/25996
dc.subject.classification	Physics, Condensed Matter	en
dc.subject.other	LA2CUO4	en
dc.subject.other	LA2-XSRXCUO4	en
dc.subject.other	SCATTERING	en
dc.title	Phase transitions and Raman spectra correlations in La2-xSrxCuO4(0.0 <= x <= 0.45)	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	The doping (x) and temperature dependence of the structural parameters and Raman spectra of high-quality La2-xSrxCuO4 polycrystalline compounds with x = 0.0-0.45 have been investigated. For x = 0 the squared frequency and the linewidth of the soft mode attributed to the tilting vibrations of the CuO6 octahedra about the (110) axis vary linearly with the laser-induced temperature rise. A similar behavior is observed at low temperatures for x greater than or equal to 0 that correlates the softening of this mode with the tetragonal-to-orthorhombic transition for the Sr-doped compounds. Changes in the apex oxygen phonon characteristics are correlated with the tetragonal-to-orthorhombic phase transition. At room temperature the relative intensity of the La/Sr mode and another mode at similar to 150 cm(-1) when compared to the apex one follows very closely the variation of the superconducting transition temperature with Sr content. This correlation is attributed to a charge redistribution at room temperature that affects the transition temperature and the bonding orbitals of the La/Sr, the apex, and the similar to 150 cm(-1) phonons.	en
heal.publisher	AMERICAN PHYSICAL SOC	en
heal.journalName	PHYSICAL REVIEW B	en
dc.identifier.isi	ISI:000089733800053	en
dc.identifier.volume	62	en
dc.identifier.issue	13	en
dc.identifier.spage	8811	en
dc.identifier.epage	8817	en