Superconductivity in YBa2minus;xSrxCu3O7minus;dgr;

摘要

We report structure, resistivity, and Meissner effect measurements on YBa2minus;xSrxCu3O7minus;dgr;for 0x2.0. We find a region of solid solubility extending at least tox=1.0 and a monotonic depression ofTcwithx. Using arguments based on structural changes with Sr doping, we speculate that the depression ofTcis due to the local distortion of the lattice in the neighborhood of the Sr site and the introduction of additional oxygen vacancies.