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

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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


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