Volume 100, Number 5, December 2012
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||13 December 2012|
On the origin of the anomalous upper critical field in quasi–one-dimensional superconductors
1 Department of Materials Engineering Science, Osaka University - 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
2 Regroupement Québecois sur les Matériaux de Pointe, Département de physique, Université de Sherbrooke Sherbrooke, Québec, Canada, J1K-2R1
3 Canadian Institute for Advanced Research - Toronto, Canada
Received: 31 August 2012
Accepted: 20 November 2012
The upper critical field, Hc2, in quasi-1D superconductors is investigated by the weak coupling renormalization group technique. It is shown that Hc2 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 the quasi-1D fluctuations effect as triggered by interference between unconventional superconductivity and density-wave instabilities. Our results give a novel viewpoint on the large Hc2 observed in TMTSF-salts in terms of a d-wave FFLO state that is predicted to be verified by Hc2 measurements under pressure.
PACS: 74.20.Mn – Nonconventional mechanisms / 74.25.Dw – Superconductivity phase diagrams / 74.70.Kn – Organic superconductors
© EPLA, 2012
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