Vortex motion and flux-flow resistivity in dirty multiband superconductors

Mihail Silaev; Artjom Vargunin

doi:10.1103/PhysRevB.94.224506

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Vortex motion and flux-flow resistivity in dirty multiband superconductors

Mihail Silaev, Artjom Vargunin

DOI 10.1103/PhysRevB.94.224506 · Physical Review B

T1

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Abstract

The conductivity of vortex lattices in multiband superconductors with high concentration of impurities is calculated based on microscopic kinetic theory at temperatures significantly smaller than the critical one. Both the limits of high and low fields are considered, when the magnetic induction is close to or much smaller than the critical field strength Hc2, respectively. It is shown that in contrast to single-band superconductors, the resistive properties are not universal but depend on the pairing constants and ratios of diffusivities in different bands. The low-field magnetoresistance can strongly exceed the Bardeen-Stephen estimation in a quantitative agreement with experimental data for the two-band superconductor MgB2.

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