Metamagnetic Phase Transition and Anomalous Hysteresis in FeCl_2・2H_2O
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概要
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Magnetization in metamagnetic FeCl_2・2H_2O has been studied in detail under both a pulsed and a static magnetic fields at temperatures between 1.5K∼14K. At high temperatures, a transition from the antiferromagnetic (A.F.) to the ferromagnetic (M_s/3) states at H_<c1> and that from the M_s/3 to the ferrimagnetic (M_s) states at H_<c2> are observed. A large hysteresis has been observed at H_<c1> even under a slowly varying field. As the temperature is lowered, a transition from the A.F. to a M_s/2 states followed by that from the M_s/2 to the M_s/3 states accompanying with that from the M_s/3 to the M_s states takes place in an increasing field. The M_s/2 state which is a high energy state in this salt becomes stable with decreasing temperature. Below 2.24K, a large hysteresis at H_<c2> is observed even under a slowly varying field. It is shown that the main origin of the anomalously large hysteresis comes from the energetic barrier due to a strong single ion anisotropy energy. The appearance of a new phase (M_s/2 state) arises from the fact that a M_s/2 state is constructed by a simple reversal of down spins in the A.F. state, while the M_s/3 state by a complicated rearrangement of up and down spins.
- 社団法人日本物理学会の論文
- 1975-07-15
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