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The pinning force for an arbitrarily oriented individual vortex in a biaxial type-II superconductor is calculated from the collective pinning theory. It is shown that in anisotropic superconductors the critical force at which the vortex starts to move can be smaller than the pinning force since the vortex will move at an angle to the acting force. Explicit expressions for this angle and for the critical force and critical current density are given.
Mikitik et al. (Thu,) studied this question.