Flux flow in a two-band superconductor with delocalized electric fields

James M. Knight; Milind N. Kunchur

doi:10.1103/PhysRevB.77.024516

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Flux flow in a two-band superconductor with delocalized electric fields

James M. Knight, Milind N. Kunchur

DOI 10.1103/PhysRevB.77.024516 · Physical Review B

T1

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Abstract

In conventional flux flow, vortex dissipation is localized in the vicinity of the vortex core leading to a viscous coefficient η that is independent of flux density B and a flux-flow conductance Gf∝1∕B. An anomalous behavior arises when a substantial quasiparticle population exists away from the cores and when the electric field and dissipation extend into those regions—a scenario that is realized in a disordered two-band superconductor with slow branch-imbalance relaxation. In this case, η rises linearly with B and Gf becomes independent of B, as observed in disordered magnesium diboride.

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.	—	Pressure not reported	unknown