Evidence for vortex pinning induced by fluctuations in the transition temperature of MgB2 superconductors
M. J. Qin, X. L. Wang, H. K. Liu, S. X. Dou
DOI 10.1103/PhysRevB.65.132508 · Physical Review B
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Abstract
The field-dependent critical current density jc(B) of a MgB2 bulk sample has been obtained using magnetic measurements. The jc(B) curves at different temperatures demonstrate a crossover from single vortex pinning to small-bundle vortex pinning, when the field is larger than the crossover field Bsb. The temperature dependence of Bsb(T) is in agreement with a model of randomly distributed weak pinning centers via the spatial fluctuations of the transition temperature (δTc pinning), while pinning due to the mean-free-path fluctuations (δl pinning) is not observed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.6 | Pressure not reported | unknown |
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