Quantum meets classical phase transition: Low-temperature anomaly in disordered superconductors near $B_{c2}$

Abstract

Strongly disordered superconductors in a magnetic field display many characteristic properties of type-II superconductivity--- except at low temperatures where an anomalous linear $T$-dependence of the resistive critical field $B_{c2}$ is routinely observed. This behavior violates the conventional theory of superconductivity, and its origin remains a long-standing puzzle. Here we report on systematic measurements of the critical magnetic field and current on amorphous indium oxide films of various levels of disorder. Surprisingly, our measurements show that the $B_{c2}$ anomaly near zero-temperature is accompanied by a clear mean-field like scaling behavior of the critical current. We demonstrate theoretically that these are consequences of the vortex-glass ground state and its thermal fluctuations. This theory further predicts the linear-$T$ anomaly to occur in films as well as bulk superconductors with a slope that depends on the normal-state sheet resistance---in agreement with experimental data. Thus, our combined experimental and theoretical study reveals universal low-temperature behavior of $B_{c2}$ in a large class of disordered superconductors.

arXiv commentMain text + SI

References in corpus (18)

• Hidden Magnetism and Quantum Criticality in the Heavy Fermion Superconductor CeRhIn5
• Localization of preformed Cooper-pairs in disordered superconductors
• Disorder-Induced Inhomogeneities of the Superconducting State Close to the Superconductor-Insulator Transition
• Fractal superconductivity near localization threshold
• Dependence of the superconducting transition temperature on the doping level in single crystalline diamond films
• Disorder and Quantum Fluctuations in Superconducting Films in Strong Magnetic Fields
• Superconducting fluctuations at low temperature
• Enhancement of long range correlations in a 2D vortex lattice by incommensurate 1D disorder potential
• Jumps in current-voltage characteristics in disordered films
• Anomalous metallic state above the upper critical field of the conventional three-dimensional superconductor AgSnSe2 with strong intrinsic disorder
• Edge and Bulk Transport in the Mixed State of a Type-II Superconductor
• Probing the pinning landscape in type-II superconductors via Campbell penetration depth
• High field termination of a Cooper-pair insulator
• Crossover from Two- to Three-Dimensional Behavior in Superfluids
• Non-perturbative microscopic theory of superconducting fluctuations near a quantum critical point
• On the theory of diamagnetism in granular superconductors
• The Upper Critical Field in Disordered Two-Dimensional Superconductors
• Efect of magnetic Gd impurities on superconductivity in MoGe films with different thickness and morphology

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