Extrinsic Origin of High-Temperature Ferromagnetism in CaB_6
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概要
- 論文の詳細を見る
The discovery of ferromagnetism in CaB_6 doped with La was surprising, because there is no magnetic element in the compound nevertheless the system involved a ferromagnetic Curie temperature as high as 600 K. In order to resolve the origin of the ferromagnetism, we have made magnetization measurements and chemical analysis of CaB_6 and LaB_6 samples synthesized under various conditions. We have found that the ferromagnetism disappears almost completely by the acid etching, and that there is strong correlation between the magnitude of reduced magnetization and the iron concentration involved in the acid. Therefore we conclude that the ferromagnetism is of extrinsic origin and can be ascribed to iron impurity phases, probably FeB and Fe_2B that have nearly the same Curie temperature as CaB_6. We suggest that these iron impurities originate from the crucible used in the synthesis. Furthermore we have measured the thermoelectric power at high temperatures including the Curie temperature. There seems to be no relation between the appearance of the ferromagnetism and the transport properties, and no evidence for the bulk ferromagnetism has been observed.
- 社団法人日本物理学会の論文
- 2003-08-15
著者
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Nishikawa Takashi
Department Of Physics Division Of Material Science Nagoya University:crest Japan Science And Technol
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Nishikawa Takashi
Department Of Physics Faculty Of Science Nagoya University
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Nishioka Takashi
Faculty Of Science Kochi University
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Nishioka Takashi
Department Of Materials Science Faculty Of Science Kochi University
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Nishioka Takashi
Department Of Physics Faculty Of Science Nagoya University
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Nishioka Takashi
Department Of Physics Nagoya University
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Nishioka Takashi
Department Of Physics Graduate School Of Science Nagoya University
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SATO N.
Department of Physics, Nagoya University
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Yamamoto A.
National Cardiovascular Center Research Institute
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MATSUBAYASHI K.
Department of Physics, Graduate School of Science, Nagoya University
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MAKI M.
Department of Physics, Graduate School of Science, Nagoya University
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MORIWAKA T.
Department of Physics, Graduate School of Science, Nagoya University
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TSUZUKI T.
Department of Physics, Graduate School of Science, Nagoya University
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NISHIOKA T.
Department of Physics, Graduate School of Science, Nagoya University
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LEE C.
National Institute of Advanced Industrial Science and Technology
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OHTA T.
National Institute of Advanced Industrial Science and Technology
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Nishioka T
Department Of Materials Science Faculty Of Science Kochi University
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Moriwaka T
Department Of Physics Graduate School Of Science Nagoya University:(present Address) Semiconductor E
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Sato N
Department Of Physics Graduate School Of Science Nagoya University
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Maki M
Department Of Applied Molecular Biosciences Graduate School Of Bioagricultural Sciences Nagoya Unive
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Tsuzuki T
Department Of Physics Graduate School Of Science Nagoya University
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YAMAMOTO Akitoshi
Shonan High School
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Lee C
National Institute Of Advanced Industrial Science And Technology
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Sato Noriaki
Department Of Physics Nagoya University
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Sato Noriaki
Nagoya Univ. Nagoya
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Nishioka T.
Department Of Material Science Faculty Of Science Kochi University
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Maki M.
Department Of Anatomy Kagoshima University School Of Dentistry
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Matsubayashi K.
Department Of Physics Graduate School Of Science Nagoya University
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TSUZUKI T.
Department of Oral Rehabilitation, Fukuoka Dental College
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