Doping and temperature dependence of inversion symmetry breaking in La2-xSrxCuO4

Siranidi, E; Lampakis, D; Liarokapis, E; Panagopoulos, C; Conder, K

dc.contributor.author	Siranidi, E	en
dc.contributor.author	Lampakis, D	en
dc.contributor.author	Liarokapis, E	en
dc.contributor.author	Panagopoulos, C	en
dc.contributor.author	Conder, K	en
dc.date.accessioned	2014-03-01T01:30:14Z
dc.date.available	2014-03-01T01:30:14Z
dc.date.issued	2009	en
dc.identifier.issn	0921-4534	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19506
dc.subject	LSCO	en
dc.subject	Raman spectroscopy	en
dc.subject	Superconductivity	en
dc.subject.classification	Physics, Applied	en
dc.subject.other	Doping concentration	en
dc.subject.other	Doping dependence	en
dc.subject.other	Eigenvectors	en
dc.subject.other	Forbidden band	en
dc.subject.other	High quality	en
dc.subject.other	Higher temperatures	en
dc.subject.other	Inversion symmetry	en
dc.subject.other	Low temperatures	en
dc.subject.other	LSCO	en
dc.subject.other	Polycrystalline compounds	en
dc.subject.other	Raman spectra	en
dc.subject.other	Symmetry reduction	en
dc.subject.other	Temperature dependence	en
dc.subject.other	Copper oxides	en
dc.subject.other	Crystal symmetry	en
dc.subject.other	Lanthanum	en
dc.subject.other	Raman scattering	en
dc.subject.other	Raman spectroscopy	en
dc.subject.other	Spectrum analysis	en
dc.subject.other	Superconducting transition temperature	en
dc.subject.other	Superconductivity	en
dc.title	Doping and temperature dependence of inversion symmetry breaking in La2-xSrxCuO4	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.physc.2009.04.007	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.physc.2009.04.007	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	The doping dependence of the Raman spectra of high quality (La2-xSrxCuO4)-O-16,18 polycrystalline compounds has been investigated at low temperatures. It is shown that symmetry forbidden bands peaked at similar to 150 cm(-1), similar to 280 cm(-1), and similar to 370 cm(-1) are activated in the (xx/yy) polarization Raman spectra due to the local breaking of the inversion symmetry mainly at low temperatures and for doping concentrations for which the compound is superconducting. The apparent A(1)-character of the activated modes in the symmetry reduced phase indicates a reduction from the D-2h to C-2v or D-2 crystal symmetries, which associates the observed modes to specific IR-active phonons with eigenvectors mainly along the c-axis. The temperature and doping dependence of this inversion symmetry breaking and the superconducting transition temperature are very similar, though the symmetry reduction occurs at significantly higher temperatures. (c) 2009 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Physica C: Superconductivity and its Applications	en
dc.identifier.doi	10.1016/j.physc.2009.04.007	en
dc.identifier.isi	ISI:000267408100017	en
dc.identifier.volume	469	en
dc.identifier.issue	13	en
dc.identifier.spage	760	en
dc.identifier.epage	765	en