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We report on a novel phase transition at $T$ = 0.9 K in the Ce-basedfilled-skutterudite compound CeOs$_{4}$Sb$_{12}$ via measurements of thenuclear-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 criticalpoint (QCP), following the relation $1/T_{1}\propto T/(T-T_{\rm N})^{1/2}$ with$T_{\rm N} = 0.06$ K in the range of $T=1.3-25$ K. The onset of either thespin-density-wave (SDW) or charge-density-wave (CDW) order at $T_{\rm 0} = 0.9$K, that is, of the first order, is evidenced by a broadening of the NQRspectrum and a marked reduction in $1/T_1$ just below $T_{\rm 0}$. The$f$-electron-derived correlated band realized in CeOs$_{4}$Sb$_{12}$ isdemonstrated to give rise to the novel phase transition on the verge of AFMQCP.Comment: 4pages, 5figure

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

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