Flux flow dissipation in superconductors with short coherence length

TL;DR

This paper investigates how quantized electronic levels in vortex cores of superconductors with short coherence lengths affect flux flow dissipation, revealing suppressed dissipation at zero temperature and distinct I-V regimes.

Contribution

It provides a theoretical analysis of flux flow dissipation considering quantized vortex core states, highlighting deviations from conventional behavior in such superconductors.

Findings

Dissipation is suppressed at zero temperature.

Distinct I-V regimes are observed due to quantized vortex core states.

Flux flow resistivity approaches conventional values near the critical temperature.

Abstract

In superconductors where the coherence length is comparable to the Fermi wavelength, the electronic levels within a vortex core are quantized, and separated by energies of the order of the superconducting gap. The absence of a continuum modifies significantly the energy dissipation due to the motion of vortices. At zero temperature, dissipation is suppressed, and the system shows non ohmic behavior. The I-V characteristics show two distinct regimes. Below a given electric field, I is strongly dependent on V. Flux flow resistivity also shows a marked dependence on temperature, and reaches conventional values near $T_c$.