Abstract

The resistive upper critical field along the b axis ${(H}_{c2}\ensuremath{\parallel}b)$ in ${(\mathrm{TMTSF})}_{2}{\mathrm{PF}}_{6}$ is investigated in detail in fields to 17.5 T and temperatures to ${T/T}_{c}\ensuremath{\sim}\frac{1}{60},$ at various pressures near the border between spin-density wave and metallic states. Remarkably, in an optimum pressure setting reported here, it is found that the onset of superconductivity persists up to 9 T $(>{4H}_{p}),$ which strongly suggests triplet Cooper pairing. Strong upward curvature with nearly diverging behavior of the critical field seems to suggest a field-dependent dimensional crossover, although the ${H}_{c2}$ enhancement is considerably more than that predicted by recent theories.

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