Spin State and Hyperfine Interaction in LaCoO_3 : NMR and Magnetic Susceptibility Studies
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概要
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^<59>Co and ^<139>La NMR measurements have been performed to study the microscopic magnetic properties closely related with the spin state of a trivalent cobalt ion in La-CoO_3. The temperature-independent ^<59>Co and ^<139>La Knight shifts below 〜30 K clearly revealed the presence of a nonmagnetic ground state at low temperatures. We calculated the temperature dependence of the magnetic susceptibility X and the ^<59>Co Knight shift ^<59>K in a single ion model with the low-spin ^1A_1 ground state above which the high-spin ^5T_2 state is located. Then, both the trigonal crystal-field and spin-orbit inter-actions are taken into account. From this analysis, we infer the presence of an antiferromagnetic exchange interaction between the high-spin states. The characteristic temperature dependence of the ^<59>Co hyperfine coupling Constant is also discussed.
- 社団法人日本物理学会の論文
- 1995-10-15
著者
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Motoya K
Sci. Univ. Tokyo Chiba
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Motoya Kiyoichiro
Department Of Metal Science And Technology Kyoto University:institute For Solid State Physics Univer
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Itoh Masayuki
Department Of Mental Retardation And Birth Defect Research National Center Of Neurology And Psychiat
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Sugahara Masaru
Department of Physics, Faculty of Science, Chiba University
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Natori Ikuomi
Department of Physics, Faculty of Science, Chiba University
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Itoh Masayuki
Department Of Applied Chemistry Kanagawa Institute Of Technology
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Sugahara Masaru
Department Of Physics Faculty Of Science Chiba University
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Natori I
Chiba Univ. Chiba
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Natori Ikuomi
Department Of Physics Faculty Of Science Chiba University
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