Physics – Condensed Matter – Superconductivity
Scientific paper
2000-03-06
J. Phys. Soc. Jpn. Vol.69 (2000) pp.1966.
Physics
Condensed Matter
Superconductivity
4 pages, 1 figure (Latex, revtex.sty, epsf.sty)
Scientific paper
10.1143/JPSJ.69.1966
We propose a phase diagram of quasi-low-dimensional type II superconductors in parallel magnetic fields, when antiferromagnetic fluctuations contribute to the pairing interactions. We point out that pairing interactions mediated by antiferromagnetic fluctuations necessarily include both singlet channels and triplet channels as attractive interactions. Usually, a singlet pairing is favored at zero field, but a triplet pairing occurs at high fields where the singlet pairing is suppressed by the Pauli paramagnetic pair-breaking effect. As a result, the critical field increases divergently at low temperatures. A possible relation to experimental phase diagrams of a quasi-one-dimensional organic superconductor is briefly discussed. We also discuss a possibility that a triplet superconductivity is observed even at zero field.
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