Exotic Heavy-Fermion State in Filled Skutterudite SmOs4Sb12

Abstract

Specific heat and transport measurements have revealed an unconventional heavy-fermion (HF) state in SmOs4Sb12 single crystals. The electronic specific-heat coefficient (gamma=0.82 J/K^2mol) and the coefficient (A) of the quadratic temperature dependence of electrical resistivity are largely enhanced, although the ratio A/gamma^2 is reduced from the Kadowaki-Woods ratio of HF materials. Both gamma and A do not show any significant decrease in applied field in contrast with Ce-based HF compounds, suggesting an unconventional origin of the heavy quasiparticles. A weak ferromagnetic ordering sets in below about 3 K, probably originating in the itinerant quasiparticles.

arXiv comment5 pages, 8 figures. To appear in J. Phys. Soc. Jpn., vol.74 (2005)

References in corpus (11)

• Time-Reversal Symmetry-Breaking Superconductivity in Heavy Fermion PrOs4Sb12 detected by Muon Spin Relaxation
• Multiple Superconducting Phases in New Heavy Fermion Superconductor PrOs4Sb12
• Unusual behaviors in the transport properties of REFe${}_4$P${}_{12}$ (RE: La, Ce, Pr, and Nd)
• Thermodynamical Study on the Heavy-Fermion Superconductor PrOs4Sb12: Evidence for Field-Induced Phase Transition
• Evidence for Unconventional Strong-coupling Superconductivity in PrOs_4Sb_12 : An Sb Nuclear Quadrupole Resonance (NQR) Study
• Anomalous heavy-fermion and ordered states in the filled skutterudite PrFe4P12
• 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
• The Crystal Field Potential of PrOs4Sb12: Consequences for Superconductivity
• Generalized Kadowaki-Woods Relation in Heavy Fermion Systems with Orbital Degeneracy
• High magnetic field phase diagram of PrOs4Sb12

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