Ground-state phase diagrams of Ising metamagnet in a mixed longitudinal and transverse magnetic field |
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Authors: | Hailing Miao Guozhu Wei Jing Liu Jiajia Geng |
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Affiliation: | 1. College of Sciences, Northeastern University, Shenyang 110004, PR China;2. International Center for Material Physics, Academia Sinica, Shenyang 110015, PR China |
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Abstract: | The ground-state magnetic properties of a two-sublattice Ising metamagnet in a mixed longitudinal and transverse magnetic field are studied within the effective-field theory. A parameter j2=J2/J1 is introduced, which reflects the strength ratio of spin coupling between adjacent planes and in each plane. In addition to the second-order transition lines, the first-order transition lines are also presented, since the ground-state energy can be calculated numerically. The ground-state phase diagrams in hx–hz are presented. The results show that when j2<0 the phase transition of the system is always first-order for hx<2.751, and when −1000?j2<0 it is always second-order for hx>4.36. For the given hx (0<hx<14.71), the longitudinal critical magnetic field increases as j2 decreases. The reentrant phenomenon occurs in the range of j2<−11.89, hx>14.71. There is no fourth-order critical point in the phase diagrams given by using EFT as found by using mean field theory (MFT). |
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Keywords: | 75.30.Kz 75.10.Jm 75.30.Gw |
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