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Raman scattering in YBa2Cu3O7 single crystals: anisotropy in normal and superconductivity states
Limonov M.F.1, Rykov A.I.1, Tajima S.1, Yamanaka A.2
1Superconductivity Research Laboratory, International Superconductivity Technology Center, 10--13, Shinonome 1-Chome, Koto-ku, Tokyo 135 Japah
2Research Institute for Electronic Science, Hokkaido University, Sapporo 060 Japan
Поступила в редакцию: 29 апреля 1997 г.
Выставление онлайн: 17 февраля 1998 г.

Precise temperature and polarization dependencies 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 kx and ky directions. The d+s gap symmetry is the only realistic symmetry in the case of Deltax#Deltay.
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