On the Influence of a Non-Local Electrodynamics in the Irreversible   Magnetization of Non-Magnetic Borocarbides
  We present an overview of the temperature, field and angular dependence of the irreversible magnetization of non-magnetic borocarbides (Y;Lu) Ni_2 B_2 C. We show that nonlocal electrodynamics influences pinning via the unusual behavior of the shear modulus in non-hexagonal lattices. On top of that, we observe that the pinning force density F_p exhibits a rich anisotropic behavior that sharply contrasts with its small mass anisotropy. When $H \bot c$, F_p is much larger and has a quite different H dependence, indicating that other pinning mechanisms are present. 
A.V. Silhanek, L. Civale, J.R. Thompson, P.C. Canfield, S.L. Bud'ko,   D.McK. Paul, C.V. Tomy