Novel Phase Transition Near the Quantum Critical Point in the Filled-Skutterudite Compound CeOs4Sb12: an Sb-NQR Study

Abstract

We report on a novel phase transition at $T$ = 0.9 K in the Ce-based filled-skutterudite compound CeOs${}_4$Sb${}_{12}$ via measurements of the nuclear-spin lattice relaxation rate $1/T_1$ and nuclear quadrupole resonance (NQR) spectrum of Sb nuclei. The temperature ($T$) dependence of $1/T_1$ behaves as if approaching closely an antiferromagnetic (AFM) quantum critical point (QCP), following the relation $1/T_1\propto T/(T-T_{\mathrm{N}}{)}^{1/2}$ with $T_{\mathrm{N}}=0.06$ K in the range of $T=1.3-25$ K. The onset of either the spin-density-wave (SDW) or charge-density-wave (CDW) order at $T_0=0.9$ K, that is, of the first order, is evidenced by a broadening of the NQR spectrum and a marked reduction in $1/T_1$ just below $T_0$. The $f$-electron-derived correlated band realized in CeOs${}_4$Sb${}_{12}$ is demonstrated to give rise to the novel phase transition on the verge of AFM QCP.

arXiv comment4pages, 5figures

References in corpus (5)

• 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
• 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
• Transport properties in CeOs${}_4$Sb${}_{12}$: Possibility of the ground state being semiconducting

Cited by in corpus (8)

• Multiband Superconductivity in Filled-Skutterudite Compounds (Pr_{1-x}La_{x})Os_{4}Sb_{12}: An Sb Nuclear-Quadruple-Resonance (NQR) Study
• Ordered Phases and Quantum Criticality in Cubic Heavy Fermion Compounds
• Skutterudite Results Shed Light on Heavy Fermion Physics
• Anomalous low temperature state of CeOs4Sb12: Magnetic field and La-impurity study
• Anomalous Metal-Insulator Transition in Filled Skutterudite CeOs${}_4$Sb${}_{12}$
• 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${}_{12}$
• Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs${}_4$Sb${}_{12}$