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J. Phys. Soc. Jpn. 74 (2005) pp. 1930-1933  |Next Article|  |Table of Contents|
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Role of p– f Hybridization in the Metal–Nonmetal Transition of PrRu4P12

Kazuaki Iwasa, Lijie Hao, Tomoo Hasegawa, Toshiaki Takagi, Kenji Horiuchi, Yoshiaki Mori, Youichi Murakami, Keitaro Kuwahara1, Masahumi Kohgi1, Hitoshi Sugawara2, Shanta Ranjan Saha3, Yuji Aoki1 and Hideyuki Sato1

Department of Physics, Tohoku University, Sendai 980-8578
1Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397
2Department of Mathematical and Natural Sciences, The University of Tokushima, Tokushima 770-8502
3Muon Science Laboratory, Institute of Material Structure Science, High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801

(Received April 27, 2005; Accepted May 2, 2005)

Electronic state evolution in the metal–nonmetal transition of PrRu4P12 has been studied by X-ray and polarized neutron diffraction experiments. It has been revealed that, in the low-temperature nonmetallic phase, two inequivalent crystal-field (CF) schemes of Pr3+ 4 f2 electrons with Γ1 and Γ4(2) ground states are located at Pr1 and Pr2 sites forming the bcc unit cell surrounded by the smaller and larger cubic Ru-ion sublattices, respectively. This modulated electronic state can be explained by the p– f hybridization mechanism taking two intermediate states of 4 f1 and 4 f3. The p– f hybridization effect plays an important role in the electronic energy gain in the metal–nonmetal transition originated from the Fermi surface nesting. ©2005 The Physical Society of Japan

KEYWORDS: metal–nonmetal transition, Fermi surface nesting, crystal-field state, p– f hybridization
URL: http://jpsj.ipap.jp/link?JPSJ/74/1930/
DOI: 10.1143/JPSJ.74.1930


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