Evolution of 4f electron states in the metal-insulator transition of Pr Ru4 P12

Kazuaki Iwasa, Lijie Hao, Keitaro Kuwahara, Masahumi Kohgi, Shanta Ranjan Saha, Hitoshi Sugawara, Yuji Aoki, Hideyuki Sato, Takashi Tayama, Toshiro Sakakibara

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Abstract

Magnetic excitations of the filled skutterudite Pr Ru4 P12 exhibiting a metal-insulator (M-I) transition at TM-I =63 K were studied by inelastic neutron scattering experiment. The spectra at temperatures much lower than TM-I are described as well-defined crystal-field excitations. With approaching TM-I, the excitation peaks broaden and shift considerably together with the temperature variation of the carrier number and the atomic displacement in the transition. The 4f electron states evolve from the well-localized state in the insulator phase to the strongly hybridized itinerant state by p-f mixing near TM-I. The hybridization is responsible for the M-I transition of Pr Ru4 P12.

Original languageEnglish
Article number024414
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume72
Issue number2
DOIs
Publication statusPublished - 2005 Jul 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Iwasa, K., Hao, L., Kuwahara, K., Kohgi, M., Saha, S. R., Sugawara, H., Aoki, Y., Sato, H., Tayama, T., & Sakakibara, T. (2005). Evolution of 4f electron states in the metal-insulator transition of Pr Ru4 P12. Physical Review B - Condensed Matter and Materials Physics, 72(2), [024414]. https://doi.org/10.1103/PhysRevB.72.024414