Abstract

Employing the layer structures of the superconducting copper oxides as intrinsic flux pinning centers, we calculate the critical current density as a function of the direction of an external magnetic field. The critical current J c has a maximum when the magnetic field is parallel to the CuO 2 layer. When the magnetic field is tilted from this layer, J c drastically decreases. The predicted anisotropy of J c is in good agreement with that observed by experiments.

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