Low-temperature anomaly in disordered superconductors near B c2 as a vortex-glass property

Benjamin Sacépé, Johanna Seidemann, Frédéric Gay, Kevin Davenport, Andrey Rogachev, Maoz Ovadia, Karen Michaeli, Mikhail V. Feigel’man

    Research output: Contribution to journalArticlepeer-review

    15 Citations (Scopus)

    Abstract

    Strongly disordered superconductors in a magnetic field exhibit many characteristic properties of type-II superconductivity—except at low temperatures, where an anomalous linear temperature dependence of the resistive critical field B c2 is routinely observed. This behaviour violates the conventional theory of superconductivity, and its origin has posed a long-standing puzzle. Here we report systematic measurements of the critical magnetic field and current on amorphous indium oxide films with various levels of disorder. Surprisingly, our measurements show that the B c2 anomaly is accompanied by mean-field-like scaling of the critical current. Based on a comprehensive theoretical study we argue that these observations are a consequence of the vortex-glass ground state and its thermal fluctuations. Our theory further predicts that the linear-temperature anomaly occurs more generally in both films and disordered bulk superconductors, with a slope that depends on the normal-state sheet resistance, which we confirm experimentally.

    Original languageEnglish
    Pages (from-to)48-53
    Number of pages6
    JournalNature Physics
    Volume15
    Issue number1
    DOIs
    Publication statusPublished - 1 Jan 2019

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