Anomalous heavy-fermion and ordered states in the filled skutterudite PrFe4P12

Article

关键词: RARE-EARTH METALS;    LIQUID BEHAVIOR;    MAGNETIC-FIELD;    KONDO;    ND;    SUSCEPTIBILITY;    Y1-XUXPD3;    PRINAG2;    POINT;    PHASE;   

DOI  :  10.1103/PhysRevB.65.064446

来源: SCIE

【 摘 要 】

Specific heat and magnetization measurements have been performed on high-quality single crystals of Filled skutterudite PrFe4P12 in order to stud), the high-field heavy-fermion state (HFS) and low-field ordered State (ODS). From a broad hump observed in C/T vs Tin HFS for magnetic fields applied along the ( 100) direction, the Kondo temperature of similar to9 K and the existence of ferromagnetic Pr-Pr interactions are deduced, The Pr-141 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 similar to 0.03 mu(B)/Pr 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.

【 授权许可】

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