Anomalous quantum Griffiths singularity in ultrathin crystalline lead films

Abstract

We study the magnetic field induced superconductor-metal transition (SMT) in ultrathin crystalline Pb films. By performing ultralow temperature transport measurement, the divergent critical exponent as an indication of quantum Griffiths singularity (QGS) is observed when approaching zero temperature quantum critical point. Distinctively, the phase boundary of SMT exhibits an anomalous behavior in low temperature regime that the onset critical field decreases with decreasing temperatures, which distinguishes our observation from earlier reports of QGS in various two-dimensional superconductors. We demonstrate that this observed anomalous phase boundary has its origin from the superconducting fluctuations in ultrathin Pb films. Our findings reveal a novel aspect of the QGS of SMT in two-dimentional superconducting systems with anomalous phase boundary.

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• The Berezinskii-Kosterlitz-Thouless Transition and Anomalous Metallic Phase in a Hybrid Josephson Junction Array
• The activated scaling behavior of quantum Griffiths singularity in two-dimensional superconductors
• Quantum Griffiths singularity in a three-dimensional superconductor to Anderson critical insulator transition
• Anomalous linear magnetoresistance in high quality crystalline lead thin films
• The Discovery of Tunable Universality Class in Superconducting $\beta$-W Thin Films
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