Magnetic Field Evolution of a Novel Phase Transition in CeOs<SUB>4</SUB>Sb<SUB>12</SUB>: <SUP>121</SUP>Sb NMR Study

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  • Yogi Mamoru
    Department of Physics and Earth Sciences, Faculty of Science, University of the Ryukyus
  • Niki Haruo
    Department of Physics and Earth Sciences, Faculty of Science, University of the Ryukyus
  • Yashima Mitsuharu
    Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University
  • Mukuda Hidekazu
    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
  • Sugawara Hitoshi
    Faculty of Integrated Arts and Sciences, The University of Tokushima
  • Sato Hideyuki
    Department of Physics, Tokyo Metropolitan University

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  • Magnetic field evolution of a novel phase transition in CeOs4Sb12: 121Sb NMR study

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We report on the evolution of a novel phase transition under magnetic field (H) in the filled skutterudite compound CeOs4Sb12 probed by 121Sb NMR. Measurements of nuclear spin–lattice relaxation rate 121(1⁄T1) for the oriented powder with H||[100] have revealed that antiferromagnetic (AFM) spin fluctuations due to the proximity of a quantum critical point at H=0 are markedly suppressed by the application of H, which is consistent with the result indicating that the AFM order at TN=0.9 K with a very small moment of 0.07μB collapses, exceeding H=1 T. As H increases further, a large reduction in 1⁄T1T was observed below the temperature T0, which varies as a dome against H with a maximum of 1.8 K at H∼6 T. The values of T1T=const. well below T0 decrease with increasing H, indicating that the residual density of states depends on H. It is suggested that the field-induced novel transition is associated with the freezing of multipole degree of freedom.

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