Effect of flux avalanches on activation energy in type-II superconductors: Evidence for self-organized criticality

Zuning Wang; Donglu Shi

doi:10.1103/PhysRevB.48.4208

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Effect of flux avalanches on activation energy in type-II superconductors: Evidence for self-organized criticality

Zuning Wang, Donglu Shi

DOI 10.1103/PhysRevB.48.4208 · Physical Review B

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Abstract

The behavior of thermally activated flux avalanches is studied for both high-Tc superconductors (single crystals of Bi2Sr2CaCu2Ox and YBa2Cu3Ox) and a conventional type-II superconductor (Nb3Sn multifilamentary wire). By combining two different mechanisms, namely, thermally activated and avalanche flux motion, we have developed a U(j) relationship in a large regime of driving force for type-II superconductors. As a result of flux avalanches, the flux-motion activation energy is considerably reduced. We have found a dynamic crossover at which the flux-motion characteristic changes from spatially and temporally correlated flux avalanches to slow creep.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Bi2Sr2CaCu2Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Nb3Sn Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown