Visualizing Rattling in PrOs4Sb12 by Single Crystal Neutron Diffraction and Maximum-Entropy Analysis
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概要
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In order to obtain a detailed picture of rattling in PrOs4Sb12, a single crystal neutron diffraction experiment and a maximum-entropy analysis were carried out. At room temperature, a widely distributed anisotropic Pr nuclear density in the Sb icosahedron cage was revealed. An unusual trapezoidal form in the cross-sectional density profile of Pr clearly demonstrates the presence of strong anharmonicity in the Pr potential, in which the $\langle 111\rangle$ direction has the maximum spread. The highest density is found at an off-center position along the same direction. The Pr density distribution becomes isotropic and sharp by cooling down to 8 K. Moreover, the highest density of Pr at 8 K is found at the center of the cage. The obtained nuclear density distribution and its temperature variation indicate that the rattling in PrOs4Sb12 is a strong anharmonic thermal motion without an off-center potential minimum.
- 2009-07-15
著者
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Kimura Hiroyuki
Institute Of Multidisciplinary Research For Advanced Materials Tohoku University
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Kohgi Masahumi
Department Of Physice Tokyo Metropoliton Univesity
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Noda Yukio
Institute Of Multidisciplinary Research For Advanced Materials Tohoku University
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Metoki Naoto
Advanced Research Center Japan Atomic Energy Research Institute
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Kaneko Koji
Advanced Science Research Center Japan Atomic Energy Research Institute
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MATSUDA Tatsuma
Advance Science Research Center, Japan Atomic Energy Agency
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Kaneko Koji
Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195
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Kohgi Masahumi
Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397
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Metoki Naoto
Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195
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NODA Yukio
Institute of Multidisciplinary Research for Advanced Materials
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Noda Yukio
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577
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Kimura Hiroyuki
Institute for Protein Research, Osaka University
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Kimura Hiroyuki
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577
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