Anomalous low temperature state of CeOs4Sb12: Magnetic field and La-impurity study

Abstract

Specific heat for single crystalline samples of Ce1-xLaxOs4Sb12 at zero-field and magnetic fields to 14 T is reported. Our results confirm enhanced value of the electronic specific heat coefficient in the paramagnetic state. They provide arguments for the intrinsic origin of the 1.1 K anomaly. This transition leads to opening of the gap at the Fermi surface. This low temperature state of CeOs4Sb12 is extremely sensitive to chemical impurities. 2% of La substituted for Ce suppresses the transition and reduces the electronic specific heat coefficient. The magnetic field response of the specific heat is also anomalous.

4 pages, 3 figures

References in corpus (4)

• Anomalous heavy-fermion and ordered states in the filled skutterudite PrFe4P12
• Low temperature specific heat of the heavy fermion superconductor PrOs${}_4$Sb${}_{12}$
• Transport properties in CeOs${}_4$Sb${}_{12}$: Possibility of the ground state being semiconducting
• Novel Phase Transition Near the Quantum Critical Point in the Filled-Skutterudite Compound CeOs4Sb12: an Sb-NQR Study

Cited by in corpus (5)

• Ordered Phases and Quantum Criticality in Cubic Heavy Fermion Compounds
• Unusual phase boundary of the magnetic-field-tuned valence transition in CeOs${}_4$Sb${}_{12}$
• Exotic Kondo-hole band resistivity and magnetoresistance of Ce${}_{1-x}$La${}_x$Os${}_4$Sb${}_{12}$ alloys
• Fermi-surface topologies and low-temperature phases of the filled Skutterudite compounds CeOs${}_4$Sb${}_{12}$ and NdOs${}_4$Sb${}_{12}$
• Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs${}_4$Sb${}_{12}$