First-order quantum phase transition in an anisotropic Ising model with infinite-range random interaction

Abstract

The phase diagram of the spin 1 quantum van Hemmen spin glass model with biaxial crystal-field anisotropy and a transverse magnetic field is studied. We investigate the effects of the two transverse crystal-field parameters ͑D x and D y ͒ and transverse field ͑⍀͒ on the phase diagrams in the T − D x plane for various values of D y and ⍀. Tricritical and reentrant behavior can be seen for appropriate ranges of these parameters.