Influence of high magnetic fields on superconducting transition of one-dimensional Nb and MoGe nanowires

Abstract

The effects of strong magnetic field on superconducting Nb and MoGe nanowires with diameter $\sim 10$ nm have been studied. We have found that the Langer-Ambegaokar-McCumber-Halperin (LAMH) theory of thermally activated phase slips is applicable in a wide range of magnetic fields and describes well the temperature dependence of the wire resistance, over eleven orders of magnitude. The field dependence of the critical temperature, $T_c$, extracted from the LAMH fits is in good quantitative agreement with the theory of pair-breaking perturbations that takes into account both spin and orbital contributions. The extracted spin-orbit scattering time agrees with an estimate ${\tau }_{so}\simeq \tau (\hslash c/Z{e}^2{)}^4$, where $\tau$ is the elastic scattering time and $Z$ is the atomic number.

arXiv commentaccepted for publication in Physical Review Letters

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