By using the generalized static replica symmetry approximation,the quantum XY spin-glass model in a longitudinal field is investigated.The thermodynamic quantities,spin-glass and self-interaction order parameters are ...By using the generalized static replica symmetry approximation,the quantum XY spin-glass model in a longitudinal field is investigated.The thermodynamic quantities,spin-glass and self-interaction order parameters are calculated numerically.The local susceptibility depending on temperature has the typical spin-glass plateau characteristic;the specific heat against temperature display a crossover feature which was discovered experimentally in the CuMn sample by Brodale et al.(J.Magn.Magn.Mater.31-34(1983)1331)and cusps sharper than that in the model with the Dzyaloshinskii-Moriya interaction.展开更多
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 coup...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.展开更多
The quantum XY spin glass model with ferromagnetic coupling in an external field is investigated numerically.The susceptibility exhibits the typical spin glass feature,the cusp of the transverse susceptibility corresp...The quantum XY spin glass model with ferromagnetic coupling in an external field is investigated numerically.The susceptibility exhibits the typical spin glass feature,the cusp of the transverse susceptibility corresponding to the phase transition is shifted to lower temperature by increasing field.In addition to the crossover feature observed in CuMn,the specific heat exhibits the 2-dimensional Ising model-like feature.展开更多
基金Supported by Science Foundation of Huazhong University of Science and Technology.
文摘By using the generalized static replica symmetry approximation,the quantum XY spin-glass model in a longitudinal field is investigated.The thermodynamic quantities,spin-glass and self-interaction order parameters are calculated numerically.The local susceptibility depending on temperature has the typical spin-glass plateau characteristic;the specific heat against temperature display a crossover feature which was discovered experimentally in the CuMn sample by Brodale et al.(J.Magn.Magn.Mater.31-34(1983)1331)and cusps sharper than that in the model with the Dzyaloshinskii-Moriya interaction.
基金Supported by the National Natural Science Foundation of China under Grant No.19774023.
文摘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.
基金Supported by the National Natural Science foundation of China under Grant No.19334001.
文摘The quantum XY spin glass model with ferromagnetic coupling in an external field is investigated numerically.The susceptibility exhibits the typical spin glass feature,the cusp of the transverse susceptibility corresponding to the phase transition is shifted to lower temperature by increasing field.In addition to the crossover feature observed in CuMn,the specific heat exhibits the 2-dimensional Ising model-like feature.
