Anomalous heavy-fermion and ordered states in the filled skutterudite
- 24 January 2002
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 65 (6), 064446
- https://doi.org/10.1103/physrevb.65.064446
Abstract
Specific heat and magnetization measurements have been performed on high-quality single crystals of filled skutterudite in order to study the high-field heavy-fermion state (HFS) and low-field ordered state (ODS). From a broad hump observed in vs T in HFS for magnetic fields applied along the direction, the Kondo temperature of and the existence of ferromagnetic Pr-Pr interactions are deduced. The nuclear Schottky contribution, which works as a highly-sensitive on-site probe for the Pr magnetic moment, sets an upper bound for the ordered moment as ion. This fact strongly indicates that the primary order parameter in the ODS is nonmagnetic, and most probably of quadrupolar origin, combined with other experimental facts. Significantly suppressed heavy-fermion behavior in the ODS suggests a possibility that the quadrupolar degrees of freedom is essential for the heavy quasiparticle band formation in the HFS. Possible crystalline-electric-field level schemes estimated from the anisotropy in the magnetization are consistent with this conjecture.
Keywords
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