Phase Transition of Uniaxial Ferromagnet Cu(NH_4)_2Br_4・2H_2O
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概要
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Magnetic properties of Cu(NH_4)_2Br_42H_2O have investigated. Particular attention is drawn to the role of anisotropy at the phase transition. The critical exponents of the susceptibility along the easy axis and the spontaneous magnetization have been obtained as γ=1.30±0.03 and β=0.34±0.02 respectively . The susceptibility perpendicular to the easy axis does not diverge at the Curie temperature. The second order phase boundary in a perpendicular field has been obtained as {T_c(0)-T(H^c_⊥)}/T_c(0)=(H^c_⊥/H^c_⊥)ω with ω=2.63±0.1 and H^0_⊥=(270±10)Oe, where H^c_⊥is the critical field at temperature T. The observed properties are well explained, except for the values of the exponents, by a molecular field model with anisotropic exchange interaction. The uniaxial character of the salt has been established. There is some evidence that the Curie temperature of powder specimen may differ from that of single crystals.
- 社団法人日本物理学会の論文
- 1971-02-05
著者
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Watanabe Takashi
Department of Chemistry, Graduate School of Science, Kyoto University
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SUZUKI Hiroyoshi
Department of Urology, Graduate School of Medicine, Chiba University
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Suzuki Hiroyoshi
Department Of Electronic Engineering Faculty Of Technology Tokyo University Of Agriculture And Techn
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Suzuki Hiroyoshi
Department Of Physics Faculty Of Science Hokkaido University
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Watanabe Takashi
Department Of Applied Physics Tohoku University
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