Magnetic Phase Transition for Dilute Heisenberg Spin System in Two-Dimensional Lattice
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概要
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The magnetic co-operative phenomena in two-dimensional Heisenberg spin system diluted with non-magnetic ions, Mn_xMg_<(1-x)>(HCOO)_2・2H_2O, were studied by measurements of the specific heat and magnetic susceptibility. The Neel temperature T_N(x), associated with the antiferromagnetic long range ordering, ran down linearly to the lower temperature side for 0.76<x<1.00. The critical concentration was estimated to be about 0.60 from the disappearance of the sharp peak on the specific heat curve which indicates the phase transition. By diluting the system with non-magnetic ions Mg^<2+>, we could observe in the specific heat curve the long range ordering peak and the broad maximum characteristic of short range ordering at separated temperatures. The appearance of the sharp peak and the broad maximum in the cource of dilution can be explained by that in the Ising spin system in two dimensions. Form these results, the behaviour similar to the Ising spin system and the two-dimensionality of this Mn^<2+> ion salt are discussed in comparison with other experiments and theoretical results.
- 社団法人日本物理学会の論文
- 1970-01-05
著者
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TAKEDA Kazuyoshi
Department of Applied Quantum Physics, Kyushu University
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MATSUURA Motohiro
Department of Physics, Faculty of Science, Kyoto University
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HASEDA Taiichiro
Department of Physics, Faculty of Science, Kyoto University
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Matsuura Motohiro
Department Of Physics Faculty Of Science Kyoto University
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Matsuura Motohiro
Department Of Electronics And Information Science Kyoto Institute Of Technology
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Haseda Taiichiro
Department Of Applied Physics Fuculty Of Engineering Ibaraki University
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Takeda Kazuyoshi
Department Of Physics Faculty Of Science Kyoto University
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Takeda Kazuyoshi
Department Of Applied Quantum Physics Faculty Of Engineering Kyushu University:institute Of Environm
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MATSUURA Motohiro
Department of Agricultural Chemistry, Kyoto University
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