纵向横向磁场作用下Ising变磁体的热力学性质

采用平均场理论研究了在纵向磁场h及横向磁场Ω同时作用下双子晶格Ising变磁体的热力学性质.计算了反映层间和层内自旋耦合强度比的参数α为零时的内能、热容、纵向交错磁矩、纵向总磁矩、横向总磁矩等物理量,给出了内能及热容随温度的变化规律,横向磁场Ω可以使系统内能和热容降低,对系统热力学性质有重要的影响.

Thermodynamic Properties of Ising Metamagnet Under Action of Both Transverse and Longitudinal Magnetic Fields

The thermodynamic properties of the two-sublattice Ising metamagnet under the action of both transverse field Ω and the longitudinal field h are studied with the mean-field theory. When the parameter α, i.e., the intensity ratio of interlayer spin coupling to intralayer one, is equal to zero, the internal energy, heat capacity, longitudinal staggered magnetization, longitudinal total magnetization and transverse total magnetization are all calculated to reveal how the internal energy and heat capacity change with temperature. The transverse field Ω enables the internal energy and heat capacity in the system to decrease, thus affecting the thermodynamic properties of Ising metamagnet greatly.