Quantum XY Spin Glass Model with Longitudinal Ferromagnetic Coupling
SHANG Yu-min1, YAO Kai-1un1,2
1Department of Physics, Huazhong University of Science and Technology Wuhan 430074
2CCAST (World Laboratory), P.O. Box 8730, Beijing 100080, and International Center for Material Physics,
Chinese Academy of Sciences, Shenyang 110015
Quantum XY Spin Glass Model with Longitudinal Ferromagnetic Coupling
SHANG Yu-min1;YAO Kai-1un1,2
1Department of Physics, Huazhong University of Science and Technology Wuhan 430074
2CCAST (World Laboratory), P.O. Box 8730, Beijing 100080, and International Center for Material Physics,
Chinese Academy of Sciences, Shenyang 110015
Abstract： 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.
1999, Vol. 16 
