Raman scattering in YBa2Cu3O7 single crystals: Anisotropy in normal and superconductivity states |
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| Authors: | M. F. Limonov A. I. Rykov S. Tajima A. Yamanaka |
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| Affiliation: | (1) Superconductivity Research Laboratory, International Superconductivity Technology Center, 10-13, Shinonome 1-Chome, Koto-ku, Tokyo 135, Japan;(2) Research Institute for Electronic Science, Hokkaido University, Sapporo 060, Japan;(3) A. F. Ioffe Physicotechnical Institute, 194021 St. Petersburg, Russia |
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| Abstract: | Precise temperature and polarization dependences of Raman spectra have been investigated for fully oxygenated twin-free YBa2Cu3O7 single crystals. We have found a striking superconductivity-induced x−y anisotropy in the temperature behavior of the 340 cm−1 line: the magnitudes of the softening and broadening are quite different in the xx-and yy-polarizations. This anisotropy suggests a contribution of the CuO-chain superconductivity with a pairing symmetry different from that for the CuO2 plane, or indicates that the superconducting gap amplitudes are different in the k x and k y directions. The d+s gap symmetry is the only realistic symmetry in the case of Δx≠Δy. Fiz. Tverd. Tela (St. Petersburg) 40, 403–412 (March 1998) Published in English in the original Russian journal. Reproduced here with stylistic changes by the Translation Editor. |
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