The temperature dependence of the upper critical magnetic field Hc2(T) in the quasi-one-dimensional molecular superconductor (TMTSF)2PF6 was determined via resistivity, for the intrachain (a) interchain (b), and interplane (c) * directions. For H along a and b, Hc2(T) exhibits pronounced positive curvature, with no sign of saturation to 0.1 K. A novel anisotropy inversion is observed, Hc2b grows larger than Hc2a and exceeds the paramagnetic limit by more than 200%. The anomalous shape of Hc2(T) is consistent with recent predictions of unconventional behavior in anisotropic superconductors, including the possibility of triplet pairing and reentrant superconductivity in very high field.
ASJC Scopus subject areas
- Physics and Astronomy(all)