Upper Critical Field inp-Wave Superconductors with Broken Symmetry

A uniaxially anisotropic p-wave interaction is shown to lead to either a polar or an axial state. We calculate the anisotropy of Hc2(T) with the assumption that EFkBTc. Weak-interaction anisotropy leads to a kink in H_c2,⊥(T). Otherwise, our results are qualitatively similar to those for an anisotropic s-wave material. Our results indicate that the anisotropy of the Hc2(T) data obtained for UPt₃ cannot be explained as intrinsic for a p-wave superconductor unless EFkBTc.