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

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 ( Δ V / 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...

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Bibliographic Details
Published in:Journal of alloys and compounds 2006-02, Vol.408, p.244-247
Main Authors: Tateiwa, N., Nakagawa, A., Fujio, K., Kawae, T., Takeda, K.
Format: Article
Language:English
Subjects:
Electrical resistance
High pressure
Itinerant electrons
Praseodymium
Valence change
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Summary: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 ( Δ V / 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 T 0 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 T 0 are discussed.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2005.04.032