Influence of nonlocal electrodynamics on the anisotropic vortex pinning in $YNi_2B_2C$

Details Influence of nonlocal electrodynamics on the anisotropic vortex pinning in $YNi_2B_2C$ Influence of nonlocal electrodynamics on the anisotropic vortex pinning in $YNi_2B_2C$

2000-06-06

arxiv.org/abs/cond-mat/0006077v2

Phys. Rev. B 64, 012512 (2001)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.64.012512

We have studied the pinning force density Fp of YNi_2B_2C superconductors for various field orientations. We observe anisotropies both between the c-axis and the basal plane and within the plane, that cannot be explained by usual mass anisotropy. For magnetic field $H \parallel c$, the reorientation structural transition in the vortex lattice due to nonlocality, which occurs at a field $H_1 \sim 1kOe$, manifests itself as a kink in Fp(H). When $H \bot c$, Fp is much larger and has a quite different H dependence, indicating that other pinning mechanisms are present. In this case the signature of nonlocal effects is the presence of a fourfold periodicity of Fp within the basal plane.

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