Abstract
No consensus has been reached about the symmetry of the Bechgaard salts superconducting phase. An RG analysis is in favor of interactions dominant in the singlet channel, but very close and sub-dominant in the triplet channel. We study the properties, in a magnetic field along the b′ direction, of a d-wave singlet phase, as well as of an f-wave triplet phase. Recent data about NMR Knight shift, as well as upper critical fields have brought strong indications about the possible symmetries. We have analyzed theoretically the consequences of these experimental data: our results are in favor of a singlet phase in low field, but of a triplet phase in large fields.
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