Thermal and Magnetic Properties of Linear Ferro- and Autiferro-Magnetic Substances, MCl_2・2NC_5H_5(M; Co, Cu)
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概要
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The magnetic specific heat of CoCl_2・2NC_5H_5 agreed with the exact solution of the ferromagnetic Ising linear chain with J/k=9.5±0.2 K above 6 K. The broad maximum expected theoretically to appear at 3.9±0.15 K was observed at 4.3±0.2 K. The magnetic susceptibility of this salt showed the rapid increase which is also the characteristic of the ferromagnetic Ising linear chain. About 85% of the total magnetic entropy Rln2 was left above the Neel point 3.17±0.02 K. The characteristic features of the antiferromagnetic linear chain of the isotropic Heisenberg spins were obtained in the case of CuCl_2・2NC_5H_5: The magnetic susceptibility quite agreed with the one calculated theoretically for ∣J∣/k=13.6±0.8 K and g=2.06±0.06. The linear dependence of the specific heat on temperature in the lowest temperature region, which is expected theoretically, was ascertained experimentally for the first time. The absolute experimental values of the magnetic specific heat agreed with the theoretical ones for ∼J∼/k=11.5±0.4 K.
- 社団法人日本物理学会の論文
- 1971-05-05
著者
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TAKEDA Kazuyoshi
Department of Applied Quantum Physics, Kyushu University
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Haseda Taiichiro
Department Of Physics Faculty Of Science Kyoto University
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Haseda Taiichiro
Department Of Applied Physics Fuculty Of Engineering Ibaraki University
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Matsukawa Shun-ichi
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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