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Exotic heavy-fermion state 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>uncovered by the de Haas–van Alphen effect
We report the de Haas--van Alphen (dHvA) experiment on the filled skutterudite ${\mathrm{PrFe}}_{4}{\mathrm{P}}_{12}$ exhibiting apparent Kondo-like behaviors in the transport and thermal properties. We have found enormously enhanced cyclotron effective mass ${m}_{\mathrm{c}}^{*}=81{m}_{0}$ in the high field phase, which indicates that ${\mathrm{PrFe}}_{4}{\mathrm{P}}_{12}$ is the first Pr compound in which really heavy …