Novel Phase Transition Near the Quantum Critical Point in the Filled-Skutterudite Compound CeOs_4Sb_<12> : An Sb-NQR Study(Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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We report on a novel phase transition at T=0.9K in the Ce-based filled-skutterudite compound CeOs_4Sb_<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 α T/(T-T_N)^<1/2> with T_N=0.06K in the range of T=1.3-25K. The onset of either the spin-density-wave (SDW) or charge-density-wave (CDW) order at T_0=0.9K, 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_4Sb_<12> is demonstrated to give rise to the novel phase transition on the verge of AFM QCP.
- 一般社団法人日本物理学会の論文
- 2005-07-15
著者
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KOTEGAWA Hisashi
Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka Universit
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OHSAKI Shuji
Graduate School of Science, Tokyo Metropolitan University
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Yogi Mamoru
Department Of Materials Engineering Science Graduate School Of Engineering Science Osaka University:
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Kitaoka Yoshio
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Zheng Guo-qing
Department Of Physical Science Graduate School Of Engineering Science Osaka University
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Sato Hideyuki
Graduate School Of Science Tokyo Metropolitan University
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Sugawara Hitoshi
Graduate School of Science, Kobe University, Kobe 657-8501, Japan
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