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119Sn-Mössbauer Spectroscopic Study of High-Tc Superconducting YBa2(Cu0.995Sn0.005)3O7-y and the Gamma-Ray Irradiation Effect

119Sn-Mössbauer measurement of the superconducting Y-Ba-Cu(Sn)-O system has been made at temperatures between 18 and 298 K. All the spectra show a superposition of an intensive singlet and a weak doublet peaks due to Sn4+ species located at different Cu(1) sites; the singlet is assigned to a square planar Cu(Sn)O4 and the doublet to a triangular Cu(Sn)O3. 60Co-γ ray (∼108 R) irradiation results in an increased fraction of the Cu(Sn)O3 species. Isomer shift (δ) and absorption area (A) increase linearly with decreasing temperature and become constant at temperatures lower than 95-100 K, which is comparable to the onset temperature of superconducting transition (94.8 K). This finding indicates that softening of lattice vibration at the Cu(1) sites, followed by a strong electron-phonon coupling, is closely concerned with the superconductivity in Cu(2)O4 layer.