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Superconducting properties of polycrystalline YBa2Cu3O7- delta : Evidence for a gauge glass.

We report measurements of ac susceptibility and I-V characteristics performed on a polycrystalline sintered sample of YBa 2 Cu 3 O 7-δ near the superconducting transition at selected magnetic belds between 0.1 and 80.9 G. The behavior of χ ac provides evidence that this sample is a gauge-glass granular superconductor. I-V measurements performed at H=0.5, 8.1, and 80.9 G show scaling behavior consistent with a superconducting phase transition and provide evidence that the gauge-glass transition occurs at a well-defined transition temperature T c