2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/19645We 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.proceedings of the NATO Advanced Research Workshop on "New trends in superconductivity", Yalta (Ukraine), September 2001Superconductivitytext