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首页> 外文期刊>Physical review, B. Condensed matter and materials physics >Thermodynamic and transport studies of the ferromagnetic filled skutterudite compound PrFe4As12
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Thermodynamic and transport studies of the ferromagnetic filled skutterudite compound PrFe4As12

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摘要

A variety of thermodynamic and transport measurements were made on high-quality single crystals of the Pr-based filled skutterudite compound PrFe4As12. Abrupt features in magnetization, ac susceptibility, specific heat, resistivity, thermoelectric power, and ultrasonic velocity reveal the onset of long range ferromagnetic order below Theta(C)=18 K. The low-temperature magnetic susceptibility is characterized by a Curie-Weiss law with an effective moment of 3.52 mu(B)/f.u. and a saturation magnetization of 2.3 mu(B)/f.u., which is consistent with a magnetic Gamma(5) triplet ground state. A gaplike reduction of the large electronic specific heat coefficient of 340 mJ/mol K-2 and several other features point to a strongly correlated electron behavior that is likely coupled to a change in magnetic and/or structural order near T-*similar or equal to 12 K. Furthermore, this complex magnetic state is found to be strongly field dependent, as evidenced by a change in the easy axis at low fields and an additional contribution to thermal conductivity appearing only at high fields.

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