[en] 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⊥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.
Disciplines :
Physics
Author, co-author :
Silhanek, Alejandro ; Katholieke Universiteit Leuven - KUL > Physics and Astronomy
Thompson, J.R.; Oak Ridge National Laboratory
Civale, L.; Los Alamos National Laboratory
Bud'ko, S.L.; Ames Laboratory
Canfield, P.; Ames Laboratory
Language :
English
Title :
The Role of Nonlocality in the Pinning Properties of Borocarbides Materials