抄録
Resistive behaviors at nonzero temperatures (T > 0) reflecting a quantum vortex-glass (VG) transition (the so-called field-tuned superconductor-insulator transition at T=0) are studied based on a quantum Ginzburg-Landau (GL) action for a s-wave pairing case containing microscopic details. The ordinary dissipative dynamics of the pair-field is assumed on the basis of a consistency between the fluctuation conductance terms excluded from GL approach and an observed negative magnetoresistance. It is shown that the VG contribution, Gvg, to 2D conductance becomes insensitive to T at an apparent VG transition field Bvg* defined at experimentally accessible temperatures but depends on the repulsive electron-electron interaction, and that, only in the dirty limit with no electron-repulsion, it takes a universal value at low T. Available resistivity data near Bvg* are explained based on our results, and an extension of the theory to 3D case is briefly discussed.
