Novel Phase Transition Near the Quantum Critical Point in the Filled-Skutterudite Compound CeOs<sub>4</sub>Sb<sub>12</sub>: An Sb-NQR Study

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  • Yogi Mamoru
    Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University
  • Kotegawa Hisashi
    Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University
  • Zheng Guo-qing
    Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University
  • Kitaoka Yoshio
    Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University
  • Ohsaki Shuji
    Graduate School of Science, Tokyo Metropolitan University
  • Sugawara Hitoshi
    Graduate School of Science, Tokyo Metropolitan University
  • Sato Hideyuki
    Graduate School of Science, Tokyo Metropolitan University

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

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We report on a novel phase transition at T=0.9 K in the Ce-based filled-skutterudite compound CeOs4Sb12 via measurements of the nuclear-spin lattice relaxation rate 1⁄T1 and nuclear quadrupole resonance (NQR) spectrum of Sb nuclei. The temperature (T) dependence of 1⁄T1 behaves as if approaching closely an antiferromagnetic (AFM) quantum critical point (QCP), following the relation 1⁄T1∝T⁄(T−TN)1⁄2 with TN=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 T0=0.9 K, that is, of the first order, is evidenced by a broadening of the NQR spectrum and a marked reduction in 1⁄T1 just below T0. The f-electron-derived correlated band realized in CeOs4Sb12 is demonstrated to give rise to the novel phase transition on the verge of AFM QCP.

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