Anisotropic Critical Currents in Aligned Sintered Compacts of YBa2Cu3O7−δ
Measurements of the critical current anisotropy in grain aligned YBa2Cu3O7−δ ceramics are presented. The low zero-field critical current Jc~102–103 A/cm2 and the sensitivity of Jc to weak magnetic fields indicates that the weak-link character of the intergranular coupling has not been improved by alignment of the grain boundaries. The unusual dependence of the critical current on the direction of the applied field is explained in terms of the anisotropic intragranular properties and the anisotropic nature of Josephson weak links. In the favorable field direction, critical currents at 1/2 tesla above 200 A/cm2 have been achieved. This represents an order of magnitude improvement over nonaligned ceramics.
KeywordsCritical Current Weak Link Normal State Resistivity Lorentzian Distribution High Critical Current
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