Mesoscopic Effects in Disordered Superconductors near Hc2
B. Spivak, Fei Zhou
DOI 10.1103/PhysRevLett.74.2800 · Physical Review Letters
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Abstract
A theory of disordered superconductors near the upper critical field Hc20 is presented. It is shown that the magnetic field dependences of critical temperatures Tc(H) in mesoscopic samples exhibit multiple reentrant superconductor–normal-metal transitions. In the framework of mean field theory Tc of bulk samples remains finite at any H and asymptotically approaches zero at large H. This means that at zero temperature the upper critical magnetic field does not exist. The role of quantum fluctuations of the phase of the order parameter is discussed.
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