\muSR Evidence of Nonmagnetic Order and 141Pr Hyperfine-Enhanced Nuclear Magnetism in the Cubic \Gamma_{3} Ground Doublet System PrTi2Al20
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概要
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A muon spin relaxation (\muSR) study of the cubic \Gamma_{3} ground doublet system PrTi2Al20 is presented. The zero-field \muSR rate shows no significant change while passing through the phase transition temperature T_{\text{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 \Gamma_{3} subspace. We also found that slow spin fluctuations remain even at 0.1 K well below T_{\text{O}}, ascribed to 141Pr hyperfine-enhanced nuclear magnetism in the nonmagnetic ground state. The 4f electronic exchange constant and 141Pr nuclear order temperature were estimated to be 0.64 K in the temperature unit and 0.13 mK, respectively, from the 141Pr nuclear spin fluctuation frequency 5.8(2) MHz at 0.1 K.
- 2011-11-15
著者
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ITO Takashi
Advanced Science Research Center, Japan Atomic Energy Agency
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Higemoto Wataru
Advanced Science Research Center Japan Atomic Energy Agency
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Ninomiya Kazuhiko
Advanced Science Research Center Japan Atomic Energy Agency
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Luetkens Hubertus
Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
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Nakatsuji Satoru
Institute for Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba 277-8581
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SAKAI Akito
Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Baines Christopher
Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
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