Reentrant superconductivity in quasi-low-dimensional systems: Magnetic field effects

The possibilities of survival of superconductivity and of reentrant behavior at high magnetic fields, i.e., for fields beyond the Pauli paramagnetic (Clogston-Chandrasehkar) limit, are discussed. These possibilities are a consequence of a magnetic field induced dimensional crossover (MFIDC) and of pairing in the extreme quantum limit. In particular, when there is no Josephson coupling between layers in weak fields, the magnetic field induces a magnetic field dependent Josephson coupling at large magnetic fields. Furthermore, the cases of singlet and tripler layered superconductors are considered for systems that behave as quasi-one-dimensional metals in their normal state. A possible phase transition between singlet and tripler superconductivity is pointed out. A special emphasis is given to organic quasi-one-dimensional superconductors like (TMTSF)(2)PF(6) and (TMTSF)(2)ClO(4) in the light of new experimental results. In addition, the cases of quasi-two-dimensional superconductors like strontium ruthenate and copper oxides are briefly discussed.