The quantum XY spin glass model with longitudinal ferromagnetic coupling is investigated in static replica symmetry limit; Several thermodynamic quantities are calculated numerically. We find that the ferromagnetic coupling enhances the stability of replica symmetric solution. A 2-dimensional Ising model like transition is found, which demonstrates that the ferromagnetic coupling increases the order of spin glass model. Affected by the ferromagnetic coupling, transverse component of the susceptibility has two cusps corresponding to transverse longitudinal spin-glass phase transition and longitudinal spin glass-paramagnetic transition separately.
部门归属
huazhong univ sci & technol, dept phys, wuhan 430074, peoples r china. chinese acad sci, int ctr mat phys, shenyang 110015, peoples r china. ccast, world lab, beijing 100080, peoples r china.;shang, ym (reprint author), huazhong univ sci & technol, dept phys, wuhan 430074, peoples r china
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