Expression for the time dependence of current density with avalanche dynamics in type-II superconductors

Zuning Wang; Donglu Shi

doi:10.1103/PhysRevB.48.16176

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Expression for the time dependence of current density with avalanche dynamics in type-II superconductors

Zuning Wang, Donglu Shi

DOI 10.1103/PhysRevB.48.16176 · Physical Review B

T1

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Abstract

Based on the concept of self-organized criticality, we have developed an expression for the current decay of type-II superconductors: j=jc-jc[kT/U0ln(1+βt/τ)]1/β. This expression can be a general description of current decay in a wide range of j. Magnetic-relaxation experimental results in both high-Tc superconductors (single crystals of YBa2Cu3Ox and Bi2Sr2CaCu2Ox) and conventional type-II superconductors (multifilamentary wire of Nb3Sn) have shown excellent agreement with our theoretical predication. Several microscopic parameters such as the characteristic energy and the characteristic time for these type-II superconductors have been extracted from the experimental data.

Source-reported materials — not catalogue approval

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