Electronic and phononic Raman scattering in detwinned YBa2Cu3O6.95 and Y0.85Ca0.15Ba2Cu3O6.95: s-wave admixture to the d(x)(2)-y(2)-wave order parameter

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dc.contributor.authorBakr, Men_AU
dc.contributor.authorSchnyder, APen_AU
dc.contributor.authorKlam, Len_AU
dc.contributor.authorManske, Den_AU
dc.contributor.authorLin, CTen_AU
dc.contributor.authorKeimer, Ben_AU
dc.contributor.authorCardona, Men_AU
dc.contributor.authorUlrich, Cen_AU
dc.date.accessioned2014-05-05T06:28:26Zen_AU
dc.date.available2014-05-05T06:28:26Zen_AU
dc.date.issued2009-08-01en_AU
dc.date.statistics2014-05-05en_AU
dc.description.abstractInelastic light (Raman) scattering has been used to study electronic excitations and phonon anomalies in detwinned, slightly overdoped YBa2Cu3O6.95 and moderately overdoped Y0.85Ca0.15Ba2Cu3O6.95 single crystals. In both samples modifications of the electronic pair-breaking peaks when interchanging the a and b axis were observed. The lineshapes of several phonon modes involving plane and apical oxygen vibrations exhibit pronounced anisotropies with respect to the incident and scattered light-field configurations. Based on a theoretical model that takes both electronic and phononic contributions to the Raman spectra into account, we attribute the anisotropy of the superconductivity-induced changes in the phonon lineshapes to a small s-wave admixture to the d(x)(2)-y(2) pair wave function. Our theory allows us to disentangle the electronic Raman signal from the phononic part and to identify corresponding interference terms. We argue that the Raman spectra are consistent with an s-wave admixture with an upper limit of 20%. © 2009, American Physical Society.en_AU
dc.identifier.articlenumber064505en_AU
dc.identifier.citationBakr, M., Schnyder, A. P., Klam, L., Manske, D., Lin, C. T., Keimer, B., Cardona, M., Ulrich, C. (2009). Electronic and phononic Raman scattering in detwinned YBa2Cu3O6.95 and Y0.85Ca0.15Ba2Cu3O6.95: s-wave admixture to the d(x)(2)-y(2)-wave order parameter. Physical Review B, 80(6), Article Number 064505. doi:10.1103/PhysRevB.80.064505en_AU
dc.identifier.govdoc4541en_AU
dc.identifier.issn1098-0121en_AU
dc.identifier.issue6en_AU
dc.identifier.journaltitlePhysical Review Ben_AU
dc.identifier.urihttp://dx.doi.org/10.1103/PhysRevB.80.064505en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5542en_AU
dc.identifier.volume80en_AU
dc.language.isoenen_AU
dc.publisherAmerica Physical Societyen_AU
dc.subjectBariumen_AU
dc.subjectCalciumen_AU
dc.subjectD wavesen_AU
dc.subjectTemperature range 0400-1000 Ken_AU
dc.subjectSuperconductivityen_AU
dc.subjectSymmetryen_AU
dc.titleElectronic and phononic Raman scattering in detwinned YBa2Cu3O6.95 and Y0.85Ca0.15Ba2Cu3O6.95: s-wave admixture to the d(x)(2)-y(2)-wave order parameteren_AU
dc.typeJournal Articleen_AU
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