Magnetic Field--Temperature Phase Diagram of the Ferro-quadrupolar State and Crystal Electric Field Effect in UCu2Sn
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概要
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The ternary uranium compound UCu2Sn shows a ferro-quadrupolar transition at T_{\text{Q}} = 16 K originating from the ordering of the non-Kramers doublet \Gamma_{5} ground state. To investigate the magnetic field--temperature phase diagram of the ferro-quadrupolar state in UCu2Sn, we measured elastic modulus C_{66} at magnetic fields of up to 14 T. We found an anisotropic field dependence of T_{\text{Q}}(H) in H\parallel [\bar{1}2\bar{1}0], [0001], and [01\bar{1}0]. We optimized the crystal electric field level scheme using C_{66} under fields, magnetic susceptibility, and electronic entropy. The quadrupolar phase diagram is well reproduced by the obtained level scheme.
- 2012-02-15
著者
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Tamaki Akira
Department Of Applied Science Tokyo Denki University
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Takabatake Toshiro
Department Of Quantum Matter Adsm Hiroshima University
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Hashio Susumu
Department Of Materials Science And Engineering Graduate School Of Engineering Tokyo Denki Universit
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Ishii Isao
Department Of Molecular And Cellular Neurobiology Gunma University Graduate School Of Medicine
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Katoh Kenichi
Department Of Applied Physics National Defense Academy
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Suzuki Takashi
Department Of Anatomic Pathology Tohoku University School Of Medicine
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Katoh Kenichi
Department of Applied Physics, National Defense Academy, Yokosuka, Kanagawa 239-8686, Japan
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Hashio Susumu
Department of Materials Science and Engineering, Tokyo Denki University, Chiyoda, Tokyo 101-8457, Japan
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Tamaki Akira
Department of Materials Science and Engineering, Tokyo Denki University, Chiyoda, Tokyo 101-8457, Japan
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