Temperature-induced magnetic phase transitions in crystals with competing single-ion and interionic magnetic anisotropies |
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Authors: | V M Kalita V M Loktev |
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Institution: | (1) Institute of Physics, National Academy of Sciences of Ukraine, pr. Nauki 144, Kiev, 03028, Ukraine;(2) Institute of Theoretical Physics, National Academy of Sciences of Ukraine, Kiev, 03143, Ukraine |
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Abstract: | Temperature-induced phase transitions in a uniaxial ferromagnetic system of spins S = 1 with competing one-particle and two-particle anisotropies are studied. It is shown that, in the case where easy-plane single-ion anisotropy dominates over easy-axis two-particle anisotropy, the transition from the paramagnetic state to a ferromagnetic state with magnetization perpendicular to the anisotropy axis is a second-order displacive magnetic phase transition. In the opposite case, where two-particle anisotropy dominates over single-particle anisotropy, the transition to a ferromagnetic state with magnetization perpendicular to the anisotropy axis is also continuous but of the order-disorder type. In a system with competing second-order one-and two-particle anisotropies, the orientational first-order phase transition can occur to a state with the magnetization directed along or perpendicular to the anisotropy axis. |
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