Enhancement of superconductivity in disordered films by parallel magnetic field
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We show that the superconducting transition temperature T c (H) of a very thin highly disordered film with strong spin-orbital scattering can be increased by a parallel magnetic field H. This effect is due to the polarization of magnetic impurity spins, which reduces the full exchange scattering rate of electrons; the largest effect is predicted for spin-1/2 impurities. Moreover, for some range of magnetic impurity concentrations, the phenomenon of superconductivity induced by magnetic field is predicted: the superconducting transition temperature T c (H) is found to be nonzero in the range of magnetic fields 0 < H* ≤ H ≤ H c .
PACS numbers74.25.Ha 74.78.−w 74.78.Na
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