Campbell penetration in the critical state of type-II superconductors
R. Willa, V. B. Geshkenbein, G. Blatter
DOI 10.1103/PhysRevB.92.134501 · Physical Review B
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Abstract
The penetration of an ac magnetic signal into a type-II superconductor residing in the Shubnikov phase depends on the pinning properties of Abrikosov vortices. Within a phenomenological theory, the so-called Campbell penetration depth λC is determined by the curvature α at the bottom of the effective pinning potential. Preparing the sample into a critical state, this curvature vanishes and the Campbell length formally diverges. We make use of the microscopic expression for the pinning force density derived within strong pinning theory and show how flux penetration on top of a critical state proceeds in a regular way.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pb-Bi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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