Evidence of Spontaneous Co Moment in a Rare-Earth-Cobalt Laves Phase Compound : ^<59>Co NMR Study of LaCo_2
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概要
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The ground-state magnetism of a high-pressure-synthesized cubic Laves phase compound LaCo_2 was investigated by ^<59>Co NMR experiments. At low temperatures, we found two kinds of NMR signals corresponding to small internal fields, -2.8 and 0.1 T, which are separated due to the anisotropy in the hyperfine field. This result reveals the weak ferromagnetism in LaCo_2, indicating that a small spontaneous Co moment can exist in rare-earth-cobalt Laves phase compounds with neither a molecular exchange field from rare-earth atoms nor effects of disorder. The ordered moment and the easy magnetization axis are estimated to be <0.1 μ_B/Co and [111], respectively.
- 社団法人日本物理学会の論文
- 2002-09-15
著者
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SHIGA Masayuki
Department of Materials Science and Engineering, Kyoto University
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NAKAMURA Hiroyuki
Department of Materials Science and Engineering, Kyoto University
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Shiga Masayuki
Department Of Material Science And Engineering Kyoto University
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Tsvyashchenko A.
Vereshchagin Institute Of High Pressure Physics Russian Academy Of Sciences
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NAKAHARA Akihito
Department of Materials Science and Engineering, Kyoto University
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FOMICHEVA L.
Vereshchagin Institute of High Pressure Physics, Russian Academy of Sciences
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Fomicheva L.
Vereshchagin Institute Of High Pressure Physics Russian Academy Of Sciences
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Nakahara Akihito
Department Of Materials Science And Engineering Kyoto University
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Nakamura Hiroyuki
Department Of Dermatology Hokkaido University Graduate School Of Medicine
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Nakamura Hiroyuki
Department Of Biochemistry Osaka Medical Center For Cancer And Cardiovascular Diseases
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Nakamura Hiroyuki
Department Of Materials Science And Engineering Kyoto University
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Nakamura Hiroyuki
Department of Advanced Materials, University of Tokyo, Kashiwa, Chiba 277-8561
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