A MIXED PLANAR SPIN-GLASS

We consider a mixed spin-glass model defined in terms of two groups of spins, XY and p-state clock variables, respectively; the interactions are infinite-range-like and between distinct groups only. An anisotro py parameter D-p, which favours p directions in the plane, is introduc ed for the XY variables, such that one can interpolate between the XY (D-p = O; p --> infinity) and p-state clock (D-p --> infinity) models. We implement Parisi's replica-symmetry-breaking Ansatz and analyse th e different types of order-parameter functions. An special attention i s dedicated to the case p = 3, for which an interesting crossover is o bserved.