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Spin-lattice coupling and tricritical behavior in the FeCl2 metamagnet |
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| Affiliation: | 2. Engineering Simulation and Aerospace computing, Northwestern Polytechnical University, Xi''an 710072, PR China;1. Department of Materials Process Engineering, Graduate School of Engineering, Nagoya University, Nagoya 464-8603, Japan;2. Magnetic Powder Metallurgy Research Center, National Institute of Advanced Industrial Science and Technology, Nagoya 463-8560, Japan |
| Abstract: | A two-sublattice Ising model is employed to determine the phase boundary of the FeCl2 metamagnet for every value of the external pressure. An effective spin hamiltonian is obtained in the λ-ensemble and the competing ferro- and antiferromagnetic exchange interactions depend on external pressure. The Néel temperature and the tricritical point are explicitly determined as a function of pressure in the low and high pressure regions of FeCl2. We show that the change in the signal of the slope of the line of tricritical points with pressure may be ascribed to the change in the ferromagnetic spin-lattice coupling. |
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