CRITICAL-STATE OF A THIN SUPERCONDUCTING PLATE IN AN INCLINED MAGNETIC-FIELD

A solution is obtained for the Bean critical-slate model in an incline d magnetic field which leads to localization of the irreversible magne tic moment induced by the shielding currents. An experimental investig ation of YBa2Cu3Oy single crystals and epitaxial films, and also plate s of classical superconductors using vector magnetometry yields result s fully consistent with the model calculations. The established geomet ric effects have an important influence on measurements of the angular dependence of the critical current and its anisotropy in a high-tempe rature superconductor. (C) 1998 American Institute of Physics.