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wave superconductivity: Analysis of the electronic Raman data of and other cuprates |
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| Authors: | R Nemetschek R Hackl M Opel R Philipp MT Béal-Monod JB Bieri K Maki A Erb E Walker |
| Institution: | (1) Walther Meissner Institut, Bayerische Akademie des Wissenschaften, 85748 Garching, Germany, DE;(2) Physique des Solides, Université Paris-sud, 91400 Orsay, France, FR;(3) Department of Physics and Astronomy, U.S.C., Los Angeles, CA 90089-0484, USA, US;(4) Departement de Physique de la Matière Condensée, Université de Genève, 24 quai E. Ansermet, 1211 Genève 4, Switzerland, CH |
| Abstract: | After briefly recalling the d + s model valid for some anisotropic high T c superconductors, we present a theory of electronic Raman spectra in that model and then compare it with new experimental data obtained for an overdoped Y123 single crystal. The d + s model appears to describe satisfactorily the experimental results, indicating a possible doping dependence of the mixing ratio. We note that the Raman spectrum of the overdoped Bi2212 could also be accounted for by the d + s superconductivity model. The case of Hg1212 (or Hg1223) is reexamined. It appears that the spontaneous breakdown of d-wave symmetry may be rather universal in high T c cuprates. Received: 3 March 1998 / Accepted: 30 April 1998 |
| Keywords: | PACS 74 72 -h High-Tc compounds[:AND:] 78 30 -j Infrared and Raman spectra |
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