Enhancement of Superconductivity in Disordered Films by Parallel Magnetic Field

Details Enhancement of Superconductivity in Disordered Films by Parallel Magnetic Field Enhancement of Superconductivity in Disordered Films by Parallel Magnetic Field

2005-04-18

arxiv.org/abs/cond-mat/0504433v1

JETP Lett. 82, 421 (2005) [Pis'ma Zh. Eksp. Teor. Fiz. 82, 473 (2005)]

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures

Scientific paper

10.1134/1.2142869

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 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-1/2 impurities. Moreover, for some range of magnetic impurity concentrations the phenomenon of {\it superconductivity induced by magnetic field} is predicted: superconducting transition temperature T_c(H) is found to be nonzero in the range of magnetic fields $0 < H^* <= H <= H_c$.

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