Upper critical field and vortex lattice in triplet superconductivity in PrOs4Sb12

Abstract We study the upper critical field of the A and B phases in the filled skutterudite PrOs 4 Sb 12 within the p+h-wave superconductivity proposed recently. In PrOs 4 Sb 12 the actual location of the A–B transition is controversial. Also one of us (MAM) found some of high quality single crystals with a single phase. We show here all the H c 2 (T) data obtained by Measson et al. are consistant with that of the A phase but none of them matches to the one for the B phase. Also the present model predicts the square vortex lattice when the magnetic field is parallel to the one of the crystal axis(say [0 0 1]) in the wide region of the T–H phase diagram.