Magnetic field induced singlet - triplet phase transition in quasi one-dimensional organic superconductors

Details Magnetic field induced singlet - triplet phase transition in quasi one-dimensional organic superconductors Magnetic field induced singlet - triplet phase transition in quasi one-dimensional organic superconductors

2007-09-05

arxiv.org/abs/0709.0675v1

EPL 80 37004 (6pp) 2007

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 2 figures, accepted in EPL

Scientific paper

10.1209/0295-5075/80/37004

We propose a theoretical model of quasi-one-dimensional superconductors, with attractive electron-electron interactions dominant in the singlet d-wave channel and sub-dominant in the p-wave channel. We discuss, in the mean field approximation, the effect of a magnetic field applied perpendicularly to the direction of the lowest conductivity. The lowest free energy phase corresponds to a singlet d-wave symmetry in low fields, but to a triplet symmetry in high fields. A first order singlet-triplet phase transition is expected at moderate applied fields of a few teslas. We propose to ascribe the recent critical field and NMR experimental data, observed in superconducting (TMTSF)2ClO4 to such an effect.

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