Exotic Heavy Fermion State in the Filled Skutterudite PrFe${}_4$P${}_{12}$ Uncovered by the de Haas-van Alphen Effect

Abstract

We report the de Haas-van Alphen (dHvA) experiment on the filled skutterudite PrFe${}_4$P${}_{12}$ exhibiting apparent Kondo-like behaviors in the transport and thermal properties. We have found enormously enhanced cyclotron effective mass $m_{\mathrm{c}}^{\ast }=81m_0$ in the high field phase (HFP), which indicates that PrFe${}_4$P${}_{12}$ is the first Pr-compound in which really heavy mass has been unambiguously confirmed. Also in the low field non-magnetic ordered phase (LOP), we observed the dHvA branch with $m_{\mathrm{c}}^{\ast }=10m_0$ that is quite heavy taking into account its small Fermi surface volume (0.15% of the Brillouin zone size). The insensitivity of mass in LOP against the magnetic field suggests that the quadrupolar interaction plays a main role both in the mass renormalization and the LOP formation.

5 pages, 5 figures, Phys. Rev. B (01 October 2002) in press

References in corpus (1)

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

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