Pressure-induced valence change in the rare earth metals: The case of praseodymium

N. Tateiwa, A. Nakagawa, K. Fujio, T. Kawae, K. Takeda

研究成果: ジャーナルへの寄稿会議記事査読

3 被引用数 (Scopus)


The rare earth metal praseodymium (Pr) transforms from the d-fcc crystal structure (Pr-III) to α-U one (Pr-IV) at 20 GPa with a large volume collapse (ΔV/V=0.16), which is associated with the valence change of the Pr ion. The two 4f electrons in the Pr ion is supposed to be itinerant in the Pr-IV phase. In order to investigate the electronic state of the phase IV, we performed the high-pressure electrical resistance measurement using the diamond anvil cell up to 32 GPa. In the Pr-IV phase, the temperature dependence of the resistance shows an upward negative curvature, which is similar to the itinerant 5f electron system in actinide metals and compounds. This suggests the narrow quasiparticle band of the 4f electrons near the Fermi energy. A new phase boundary is found at T0 in the Pr-IV phase. From the temperature and magnetic field dependences of the resistance at 26 GPa, the ground state of the Pr-IV phase is suggested to be magnetic. Several possibilities for the origin of T0 are discussed.

ジャーナルJournal of Alloys and Compounds
出版ステータス出版済み - 2月 9 2006
イベントProceedings of the Rare Earths'04 in Nara, Japan -
継続期間: 11月 7 200411月 12 2004

!!!All Science Journal Classification (ASJC) codes

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学


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