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Raman scattering in YBa2Cu3O7 single crystals: Anisotropy in normal and superconductivity states

  • Metals. Superconductors
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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.

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Authors and Affiliations

  1. Superconductivity Research Laboratory, International Superconductivity Technology Center, 10-13, Shinonome 1-Chome, Koto-ku, Tokyo, 135, Japan

    M. F. Limonov, A. I. Rykov & S. Tajima

  2. Research Institute for Electronic Science, Hokkaido University, Sapporo, 060, Japan

    A. Yamanaka

  3. A. F. Ioffe Physicotechnical Institute, 194021, St. Petersburg, Russia

    M. F. Limonov

Authors
  1. M. F. Limonov
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  2. A. I. Rykov
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  3. S. Tajima
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  4. A. Yamanaka
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Additional information

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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Limonov, M.F., Rykov, A.I., Tajima, S. et al. Raman scattering in YBa2Cu3O7 single crystals: Anisotropy in normal and superconductivity states. Phys. Solid State 40, 367–376 (1998). https://doi.org/10.1134/1.1130327

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  • DOI: https://doi.org/10.1134/1.1130327

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