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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/5542

Title: 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
Authors: Bakr, M
Schnyder, AP
Klam, L
Manske, D
Lin, CT
Keimer, B
Cardona, M
Ulrich, C
Keywords: Barium
Calcium
D waves
Temperature range 0400-1000 K
Superconductivity
Symmetry
Issue Date: 1-Aug-2009
Publisher: America Physical Society
Citation: Bakr, 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.80.064505
Abstract: Inelastic 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.
URI: http://dx.doi.org/10.1103/PhysRevB.80.064505
http://apo.ansto.gov.au/dspace/handle/10238/5542
ISSN: 1098-0121
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