Vortex Structures in an Anisotropic Pairing Superconducting State with Odd-Parity

抄録

In order to understand the phase diagram H vs T in UPt₃ the possible vortex structures are investigated theoretically. Our study is based on the pairing function which belongs to one-dimensional representation with odd-parity. In addition to the usual Abrikosov vortex two kinds of the non-trivial vortices are found where the multiple components of the pairing function are simultaneously non-vanishing. Each vortex solution corresponds to the triangular and square lattices. They should appear in a low field region (H<0.1 H_c2) for the reasonable parameter values. Recent experiments on UPt₃, in particular, the small angle neutron experiment for the vortex structure investigations, are discussed in this connection.