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The Role of Nonlocality in the Pinning Properties of Borocarbides Materials

A. V. Silhanek·J. R. Thompson·L. Civale·S. L. Bud'ko·P. Canfield
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Abstract

An experimental review on the influence of nonlocal electrodynamics in the vortex pinning properties of non-magnetic borocarbide superconductors is presented. We show that the pinning force density Fp exhibits a rich and complex anisotropic behavior that sharply contrast with the small mass anisotropy of these compounds. For magnetic fields H applied parallel to the crystallographic c-axis, the first order reorientation transition between two rhombic lattices manifests itself as a kink in Fp(H). For H perpendicular to the c-axis, a much larger Fp(H) and a slower relaxation rate is observed. In this field configuration, nonlocality induces a fourfold periodicity in Fp when H is rotated within the square basal plane. Unlike the out-of-plane anisotropy, which persists for increasing impurity levels, the in-plane fourfold anisotropy can be strongly suppressed by reducing the electronic mean free path. This result unambiguously demonstrate that the in-plane anisotropy is a consequence of nonlocal effects.

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A. V. Silhanek, J. R. Thompson, L. Civale, S. L. Bud'ko, P. Canfield. 2003-10-09. The Role of Nonlocality in the Pinning Properties of Borocarbides Materials. https://arxiv.org/abs/cond-mat/0310188

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