title: Measurements of the magnetic-field-tuned conductivity of disordered two-dimensional Mo43Ge57 and InOx superconducting films: evidence for a universal minimum superfluid response.
abstract: Our measurements of the low frequency ac conductivity in strongly disordered two-dimensional films near the magnetic-field-tuned superconductor-to-insulator transition show a sudden drop in the phase stiffness of superconducting order with either increased temperature or magnetic field. Surprisingly, for two different material systems, the abrupt drop in the superfluid density in a magnetic field has the same universal value as that expected for a Berezinskii-Kosterlitz-Thouless transition in a zero magnetic field. The characteristic temperature at which phase stiffness is suddenly lost can be tuned to zero at a critical magnetic field, following a power-law behavior with a critical exponent consistent with that obtained in previous dc transport studies on the dissipative side of the transition.
authors: Joseph Henry Laboratories and Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.
authors: S
authors: S
authors: Misra
authors: L
authors: L
authors: Urban
authors: M
authors: M
authors: Kim
authors: G
authors: G
authors: Sambandamurthy
authors: A
authors: A
authors: Yazdani