Ordering of Co(HCOO)_2・2H_2O Studied by Proton NMR : Magnetic Sandwich System of Antiferromagnetic Planes with Paramagnetic Ions
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概要
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Proton NMR of an approximate magnetic sandwich system Co(HCOO)_2・2H_2O is investigated. From the analysis of angular dependence of the resonance frequency, we determine all the components of paramagnetic sublattice susceptibility tensors and of spontaneous sublattice magnetizations which can not be obtained by the other experiments such as susceptibility, magnetization or torque measurement. These sublattice magnetizations show that exchange interactions in A plane and between A and B planes are antiferro- and ferromagnetic, respectively. The temperature dependence of spontaneous staggered magnetizations L^O_A and L^O_B on A and B planes is obtained from that of the resonance frequency. The results ∣L^O_A∣ ∝ε^β(β=0.13^±0.01) and ∣L^O_B∣∝∣L^O_A∣/T seem to indicate that the sandwiched paramagnetic ions do not participate cooperatively in the phase transition at T_N with the ions on A plane.
- 社団法人日本物理学会の論文
- 1976-09-15
著者
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Yamakawa Hiroyuki
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Matsuura Motohiro
Department Of Electronics And Information Science Kyoto Institute Of Technology
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MATSUURA Motohiro
Department of Agricultural Chemistry, Kyoto University
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Yamakawa Hiroyuki
Department of Cardiology, Keio University
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