A de Haas-van Alphen study of the filled skutterudite compounds PrOs${}_4$As${}_{12}$ and LaOs${}_4$As${}_{12}$

Abstract

Comprehensive magnetic-field-orientation dependent studies of the susceptibility and de Haas-van Alphen effect have been carried out on single crystals of the filled skutterudites PrOs${}_4$As${}_{12}$ and LaOs${}_4$As${}_{12}$ using magnetic fields of up to 40~T. Several peaks are observed in the low-field susceptibility of PrOs${}_4$As${}_{12}$, corresponding to cascades of metamagnetic transitions separating the low-field antiferromagnetic and high-field paramagnetic metal (PMM) phases. The de Haas-van Alphen experiments show that the Fermi-surface topologies of PrOs${}_4$As${}_{12}$ in its PMM phase and LaOs${}_4$As${}_{12}$ are very similar. In addition, they are in reasonable agreement with the predictions of bandstructure calculations for LaOs${}_4$As${}_{12}$ on the PrOs${}_4$As${}_{12}$ lattice. Both observations suggest that the Pr 4$f$ electrons contribute little to the number of itinerant quasiparticles in the PMM phase. However, whilst the properties of LaOs${}_4$As${}_{12}$ suggest a conventional nonmagnetic Fermi liquid, the effects of direct exchange and electron correlations are detected in the PMM phase of PrOs${}_4$As${}_{12}$. For example, the quasiparticle effective masses in PrOs${}_4$As${}_{12}$ are found to decrease with increasing field, probably reflecting the gradual suppression of magnetic fluctuations associated with proximity to the low-temperature, low-field antiferromagnetic state.

References in corpus (8)

• Fermi surface of the heavy fermion superconductor PrOs${}_4$Sb${}_{12}$
• Exotic Heavy Fermion State in the Filled Skutterudite PrFe${}_4$P${}_{12}$ Uncovered by the de Haas-van Alphen Effect
• Transport properties of the heavy fermion superconductor PrOs${}_4$Sb${}_{12}$
• Suppression of the $\gamma -\alpha$ structural phase transition in $C{e}_{0.8}L{a}_{0.1}T{h}_{0.1}$ by large magnetic fields
• Multiple ordered phases in the filled skutterudite compound PrOs${}_4$As${}_{12}$
• Separation of energy scales in the kagome antiferromagnet TmAgGe: a magnetic-field-orientation study up to 55 T
• Fermi Surface Properties of Low Concentration Ce${}_x$La${}_{1-x}$B${}_6$: dHvA
• Heavy fermion superconductivity in the filled skutterudite compound PrOs${}_4$Sb${}_{12}$

Cited by in corpus (6)

• Numerical extraction of de Haas - van Alphen frequencies from calculated band energies
• Fermi surface, possible unconventional fermions, and unusually robust resistive critical fields in the chiral-structured superconductor AuBe
• Unusual phase boundary of the magnetic-field-tuned valence transition in CeOs${}_4$Sb${}_{12}$
• Fermi-surface topologies and low-temperature phases of the filled Skutterudite compounds CeOs${}_4$Sb${}_{12}$ and NdOs${}_4$Sb${}_{12}$
• Inelastic neutron scattering studies of Crystal Field Levels in PrOs${}_4$As${}_{12}$
• Fermi surface topology and non-trivial Berry phase in the flat-band semimetal Pd${}_3$Pb