Reentrant behavior in the transverse ordering of m-vector spin glasses

The infinite-range-interaction m-vector spin glass, in the presence of a un iaxial anisotropy, as well as of an external magnetic field (both along the same axis). is studied through the replica method. It is shown that the Ga bay-Toulouse line, which signals the ordering of the transverse degrees of freedom in the magnetic-field versus temperature plane, exhibits a reentran t behavior. Possible connections with experimental observations are discuss ed. (C) 1998 Elsevier Science B.V.