Well-Defined Crystal Field Splitting Schemes and Non-Kramers Doublet Ground States of f Electrons in PrT_{2}Zn
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概要
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Inelastic neutron scattering studies of PrT_{2}Zn<inf>20</inf>(T = Ir, Rh, and Ru) were carried out in order to reveal f electron states indispensable for the low-temperature properties of PrT_{2}Zn<inf>20</inf>associated with multipole degrees of freedom. Sharp excitation peaks, which are located within excitation energies of less than 10 meV, are attributed to crystal field splitting level schemes of 4f^{2} in Pr<sup>3+</sup>ions. Data of the Ir-based compound is explained by a non-Kramers doublet ground state in the local symmetry T_{d} for this system. Results of the Rh-based compound are explained by the scheme for the Pr-site local cubic symmetry T in the low-temperature structural phase, which is lower than T_{d}. In the Ru-based compound, the doublet is split as a result of the loss of local cubic symmetry through structural transformation. These experimental results confirm the non-Kramers doublet ground state that causes the quadrupole ordering or orbital Kondo effect predicted for this series of compounds.
- 2013-04-15
著者
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Onimaru Takahiro
Department Of Quantum Matter Adsm Hiroshima University
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Takabatake Toshiro
Department Of Quantum Matter Adsm Hiroshima University
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Iwasa Kazuaki
Department Of Physics Faculty Of Science And Technology Keio University
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Kobayashi Hiroki
Department Of Analytical Chemistry Of Medicines Showa Phamaceutical University
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Ohira-Kawamura Seiko
Materials and Life Science Division, J-PARC Center, Tokai, Ibaraki 319-1195, Japan
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Nakajima Kenji
Materials and Life Science Division, J-PARC Center, Tokai, Ibaraki 319-1195, Japan
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Inamura Yasuhiro
Materials and Life Science Division, J-PARC Center, JAEA, Tokai, Ibaraki 319-1195, Japan
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Matsumoto Keisuke
Department of Electrical Engineering, College of Science and Technology, Nihon University, Chiyoda, Tokyo 101-8308, Japan
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Kikuchi Tatsuya
Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
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Nagasawa Naohiro
Department of Quantum Matter, ADSM and Institute for Advanced Material Research, Hiroshima University, Higashihiroshima, Hiroshima 739-8530, Japan
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Ohira-Kawamura Seiko
Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
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Nakajima Kenji
Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
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Matsumoto Keisuke
Department of Quantum Matter, ADSM and Institute for Advanced Material Research, Hiroshima University, Higashihiroshima, Hiroshima 739-8530, Japan
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Inamura Yasuhiro
Materials and Life Science Division, J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
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