Rattling of Pr in Heavy-Fermion Superconductor PrOs<sub>4</sub>Sb<sub>12</sub>Revealed by Neutron Powder Diffraction
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- Kaneko Koji
- Advanced Science Research Center, Japan Atomic Energy Agency
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- Metoki Naoto
- Advanced Science Research Center, Japan Atomic Energy Agency Department of Physics, Tohoku University
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- Matsuda Tatsuma D.
- Advanced Science Research Center, Japan Atomic Energy Agency
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- Kohgi Masahumi
- Department of Physics, Tokyo Metropolitan University
書誌事項
- タイトル別名
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- Rattling of Pr in Heavy-Fermion Superconductor PrOs4Sb12 Revealed by Neutron Powder Diffraction
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説明
Neutron powder diffraction experiments were carried out on the heavy-fermion superconductor PrOs4Sb12 down to 7.7 K in order to reveal the thermal displacement of Pr and investigate the possible existence of off-center potential minima for Pr in the Sb cage. Rietveld analysis with the structure in which Pr is located at the center of the Sb cage well reproduces the observed patterns. A large thermal displacement was obtained for Pr of UPr=0.0344 Å2 at 295.1 K, roughly corresponding to a mean thermal displacement of 0.18 Å. This value is 5 times larger than those of other constituents, UOs and USb. UPr remains large, UPr=0.0062 Å2, even at 7.7 K, which is twice as large as UOs and USb. Neither structural transition nor significant change of the Sb cage accompanied this change in UPr. The large UPr and its strong temperature dependence indicate the rattling of Pr under a shallow potential in the Sb cage. An equal distribution of Pr at 12e sites (x00) was introduced to approximate the off-center potential minima. The R factors were not improved by the introduction of the off-center site.
収録刊行物
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- Journal of the Physical Society of Japan
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Journal of the Physical Society of Japan 75 (3), 034701-, 2006
一般社団法人 日本物理学会
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詳細情報 詳細情報について
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- CRID
- 1390001204189828224
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- NII論文ID
- 110004704683
- 210000106045
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- NII書誌ID
- AA00704814
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- BIBCODE
- 2006JPSJ...75c4701K
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- ISSN
- 13474073
- 00319015
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- NDL書誌ID
- 7852518
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- 本文言語コード
- en
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