The magnetic penetration depth λ(T, H, j) was measured in the presence of a slowly relaxing supercurrent j. In single crystal Bi2Sr2CaCu2O8 below approximately 25 K, λ(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/jc where jc is the critical current defined through the Labusch parameter. Similar effects were observed in other cuprates and in an organic superconductor.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - May 1 2003|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics