2005/06/09 by Naoyuki Tateiwa, Tateiwa, Naoyuki, Akitoshi Nakagawa +7
Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #FOS: Physical sciences #High-pressure geophysics and materials #Nuclear Materials and Properties #Rare-earth and actinide compounds #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.cond-mat/0506222
This paper was presented in the international conference Rare Earth '04 in Nara Japan.It will appear in Journal of Alloys and Compounds
arxiv created 2005/06/09 · openalex publication_date 2005/06/09 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 (\rmΔ V/V = 0.16), which is associated with the valence change of the Pr ion. The two 4\it f 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 5\it f electron system in actinide metals and compounds. This suggests the narrow quasiparticle band of the 4\it f 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.