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Anomalous heavy-fermion and ordered states in the filled skutterudite<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">PrFe</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">P</mml:mi></mml:mrow><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
Specific heat and magnetization measurements have been performed on high-quality single crystals of filled skutterudite ${\mathrm{PrFe}}_{4}{\mathrm{P}}_{12}$ in order to study the high-field heavy-fermion state (HFS) and low-field ordered state (ODS). From a broad hump observed in $C/T$ vs T in HFS for magnetic fields applied along the $〈100〉$ direction, the …