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arXiv · 1209.0094

On the Origin of the Anomalous Upper Critical Field in Quasi-One-Dimensional Superconductors

Yuki Fuseya·Claude Bourbonnais·Kazumasa Miyake
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Abstract

Upper critical field, H_c2, in quasi-1D superconductors is investigated by the weak coupling renormalization group technique. It is shown that H_c2 greatly exceeds not only the Pauli limit, but also the conventional paramagnetic limit of the Flude-Ferrell-Larkin-Ovchinnikov (FFLO) state. This increase is mainly due to quasi-1D fluctuations effect as triggered by interference between unconventional superconductivity and density-wave instabilities. Our results give a novel viewpoint on the large H_c2 observed in TMTSF-salts in terms of a d-wave FFLO state that is predicted to be verified by the H_c2 measurements under pressure.

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Yuki Fuseya, Claude Bourbonnais, Kazumasa Miyake. 2012-09-01. On the Origin of the Anomalous Upper Critical Field in Quasi-One-Dimensional Superconductors. https://doi.org/10.1209/0295-5075%2F100%2F57008

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