High-Temperature Magnetic Investigations on Uranium Compounds(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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We investigated the magnetic property of typical uranium compounds by measuring the magnetic susceptibility in an extended temperature range up to about 800 K. The magnetic susceptibility follows the Curie-Weiss law for a localized 5f^2-electron compound UPd_3 and a ferromagnetic insulator UFe_4P_<12>. In most of the investigated compounds we observed a crossover effect of the 5f electrons from a low-temperature itinerant nature to a high-temperature localized one. This is found to be characteristic for ferromagnetic superconductors such as UGe_2 and UIr, and also for antiferromagnets like USb_2 or UNiSb_2. To assess an extension of this characteristic property in the uranium compounds we also investigated typical 5f-itinerant compounds like UGa_3 and UPtGa_5. The crossover effect is essentially important in heavy fermion compounds such as UPt_3, UPd_2Al_3 and URu_2Si_2. Even in the paramagnetic compound of UB_4, the magnetic susceptibility is not temperature-independent, but approaches a 5f-localized tendency at high temperatures. Since the samples were single crystals, we were also able to trace the evolution of the magnetic anisotropy. The high-temperature anisotropic susceptibility data were analyzed on the basis of the crystalline electric field scheme.
- 社団法人日本物理学会の論文
- 2005-05-15
著者
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AOKI Dai
Institute for Materials Research, Tohoku University
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YAMAMOTO Etsuji
Advanced Science Research Center, Japan Atomic Energy Research Institute
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MATSUDA Tatsuma
Advanced Science Research Center, Japan Atomic Energy Research Institute
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HAGA Yoshinori
Advanced Science Research Center, Japan Atomic Energy Research Institute
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ONUKI Yoshichika
Advanced Science Research Center, Japan Atomic Energy Research Institute
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IKEDA Shugo
Advanced Science Research Center, Japan Atomic Energy Research Institute
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Aoki Dai
Institute For Materials Research Tohoku University
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TAKEUCHI Tetsuya
Low Temperature Center, Osaka University
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GALATANU Andrei
Advanced Science Research Center, Japan Atomic Energy Research Institute
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Imada Shin
Osaka Univ. Osaka Jpn
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Ikeda Shin-ichi
Nanoelectronics Research Institute Aist
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Aoki D
Institute For Materials Research Tohoku University
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Ikeda Susumu
Graduate School Of Science And Engineering Yamagata University
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Haga Yoshinori
Advanced Science Research Center Japan Atomic Energy Research Institute
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Yamamoto Etsuji
Advanced Science Research Center Japan Atomic Energy Agency
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Galatanu Andrei
Advanced Science Research Center Japan Atomic Energy Research Institute
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Takeuchi Tetsuya
Low Temperature Center Osaka University
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Matsuda Tatsuma
Advanced Science Research Center Japan Atomic Energy Agency
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MATSUDA Tatsuma
Advance Science Research Center, Japan Atomic Energy Agency
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TAKEUCHI Tetsuya
Low Temperature Center, Osaka University:Research Center for Materials Science at Extreme Conditions, Osaka University
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ONUKI Yoshichika
Advanced Science Research Center, Japan Atomic Energy Agency:Department of Physics, Graduate School of Science, Osaka University
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HAGA Yoshinori
Advance Science Research Center, Japan Atomic Energy Agency
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IKEDA Shugo
Advanced Science Research Center, Japan Atomic Energy Agency
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