Campbell Penetration Depth of a Superconductor in the Critical State

Details Campbell Penetration Depth of a Superconductor in the Critical State Campbell Penetration Depth of a Superconductor in the Critical State

2002-11-03

arxiv.org/abs/cond-mat/0211047v1

Phys. Rev. B 67, 184501 (2003)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.67.184501

The magnetic penetration depth $\lambda(T,H,j)$ was measured in the presence of a slowly relaxing supercurrent, $j$. In single crystal $\mathrm{Bi_2Sr_2CaCu_2O_8}$ below approximately 25 K, $\lambda(T,H,j)$ is strongly hysteretic. We propose that the irreversibility arises from a shift of the vortex position within its pinning well as $j$ changes. The Campbell length depends upon the ratio $j/j_{c}$ where $j_{c}$ is the critical current defined through the Labusch parameter. Similar effects were observed in other cuprates and in an organic superconductor.

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