µSR Evidence of Nonmagnetic Order and <sup>141</sup>Pr Hyperfine-Enhanced Nuclear Magnetism in the Cubic Γ<sub>3</sub> Ground Doublet System PrTi<sub>2</sub>Al<sub>20</sub>

DOI Web Site 被引用文献24件 参考文献22件
  • Takashi U. Ito
    Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  • Wataru Higemoto
    Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  • Kazuhiko Ninomiya
    Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  • Hubertus Luetkens
    Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
  • Christopher Baines
    Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
  • Akito Sakai
    Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
  • Satoru Nakatsuji
    Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan

説明

A muon spin relaxation (µSR) study of the cubic Γ 3 ground doublet system PrTi 2 Al 20 is presented. The zero-field µSR rate shows no significant change while passing through the phase transition temperature T O =2.0 K, indicating that a nonmagnetic order parameter lies behind the ordered state. This is consistent with a ferroquadrupole ordering scenario standing on quadrupole degrees of freedom active in the Γ 3 subspace. We also found that slow spin fluctuations remain even at 0.1 K well below T O , ascribed to 141 Pr hyperfine-enhanced nuclear magnetism in the nonmagnetic ground state. The 4 f electronic exchange constant and 141 Pr nuclear order temperature were estimated to be 0.64 K in the temperature unit and 0.13 mK, respectively, from the 141 Pr nuclear spin fluctuation frequency 5.8(2) MHz at 0.1 K.

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