Quantum Criticality inside the Anomalous Metallic State of a Disordered Superconducting Thin Film

Transport signatures of fragile-glass dynamics in the melting of the two-dimensional vortex lattice

“…The behavior observed in the high-field (H > H * , T 0 = 0, T > T c ) regime ("Arrhenius" in Fig. 2) is, therefore, consistent with the thermally-activated collective motion of vortices in the presence of strong pinning, similar to previous studies of disordered SC films, including a-MoGe [21,22]. This conclusion is further supported by our measurements of the differential resistance (dV /dI) versus dc current bias I dc at fixed H (see Methods).…”

Entropy-Based Theory of Thermomagnetic Phenomena: Poynting Vector, Vorticity, and Advanced Sensing

“…Our vorticity-based interpretation of thermomagnetic phenomena in thin films of disordered superconductors is well aligned with recent studies of the Nernst effect near the superconductor -insulator transition (SIT). [93,94] Due to vorticity a large Nernst signal is observed on both the superconducting and the insulating sides with a signal peak close to the critical point. However, the nature of the transport entropy transfered by vortices near SIT is still under investigations.…”

“…However, the nature of the transport entropy transfered by vortices near SIT is still under investigations. [94] ELECTRICAL READOUT WITH PERFECT THERMAL ISOLATION FOR QUANTUM SENSORS Quantum currents, -magnetization, superconducting, persistent and topological edge currents, -transfer the electric charge and spin, but not entropy. This unique combination of thermal and electric/spin properties is valuable for many applications related to quantum computing, networking, and sensing.…”

Resistivity in Quantum Vortex Liquid of Clean Two-Dimensional Superconductor

“…However, it has been clarified recently that most of the T -independent behavior of the resistivity is removed by adequately filtering external radiation from the film sample [6,7], strongly suggesting that external noise has created the quantum metallic behavior in experiments. The presence of a quantum metal state has been still argued in some recent experimental works on relatively clean systems, i.e., with weak disorder [5,[8][9][10]. Since a nearly flat resistivity curve is seen even in the temperature range of the same order as the mean field T c in some film samples, such a peculiar resistive behavior cannot be due to the randomness or the sample disorder which becomes more effective at lower temperatures.…”

“…Since a nearly flat resistivity curve is seen even in the temperature range of the same order as the mean field T c in some film samples, such a peculiar resistive behavior cannot be due to the randomness or the sample disorder which becomes more effective at lower temperatures. In addition, a crossing behavior leading to assuming the presence of a superconductor to insulator quantum transition (SIT) at zero temperature [11,12] is seen at relatively higher fields in samples of relatively clean films [8,9]. Then, one might wonder what the flat resistivity curve appearing in clean samples in lower fields than the apparent SIT field implies.…”