Enhancement of Superconductivity in Disordered Films by Parallel Magnetic Field
M. Yu. Kharitonov+*, M. V. Feigelman+
+L. D. Landau Institute for Theoretical Physics RAS, 119334 Moscow, Russia
*Ruhr-Universität Bochum, 44801 Bochum, Germany
PACS: 74.25.Ha, 74.78.-w, 74.78.Na
Abstract
We show that the superconducting transition temperature Tc(H)
of a very thin highly disordered film with strong spin-orbital scattering
can be increased by parallel magnetic field H.
This effect is due to polarization of magnetic impurity spins
which reduces the full exchange scattering rate of electrons;
the largest effect is predicted for spin-
impurities.
Moreover, for some range of magnetic impurity concentrations
the phenomenon of superconductivity induced by magnetic field
is predicted: superconducting transition temperature Tc(H)
is found to be nonzero in the range of magnetic fields
.