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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.

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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 k_x and k_y directions. The d+s gap symmetry is the only realistic symmetry in the case of Delta_x#Delta_y.

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