QUANTUM SITE RANDOM XY SPIN GLASSES IN A RANDOM FIELD

摘要

A quantum spherical version of the site-random XY model in the presence of random field is presented in the boson space. In the phase diagram drawn as a function of the strength of random field, we find that the ferromagnetic and spin-glass phases are reduced by quantum fluctuations and destroyed completely by random-field fluctuations with sufficiently large values of the random-field variance. [References: 49]