Abstract
Abstract Critical field and critical current density measurements performed on single crystals of Y 1 Ba 2 Cu 3 O 7- x demonstrate that its superconducting properties are those of a conventional superconductor with uniaxial ansiotropy. The high temperature upper critical field anisotropy is temperature independent except very near T c , and in the best crystal had a value of 7:1. The anisotropy in the critical current density is larger than this, particularly at high fields and high temperatures. The critical field data is generally well described by anisotropic Ginzburg-Landau theory which is used to calculate the coherence lengths and other parameters describing the superconductivity.
Published Version
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