mu SR Evidence of Nonmagnetic Order and Pr-141 Hyperfine-Enhanced Nuclear Magnetism in the Cubic Gamma(3) Ground Doublet System PrTi2Al20

作者：Ito Takashi U^*; Higemoto Wataru; Ninomiya Kazuhiko; Luetkens Hubertus; Baines Christopher; Sakai Akito; Nakatsuji Satoru

来源：Journal of the Physical Society of Japan, 2011, 80(11): 113703.

DOI：10.1143/JPSJ.80.113703

• cubic Gamma(3) doublet system
• quadrupole ordering
• Pr-141 hyperfine-enhanced nuclear magnetism

A muon spin relaxation (mu SR) study of the cubic Gamma(3) ground doublet system PrTi2Al20 is presented. The zero-field mu SR 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 Gamma(3) subspace. We also found that slow spin fluctuations remain even at 0.1K well below T-O, ascribed to Pr-141 hyperfine-enhanced nuclear magnetism in the nonmagnetic ground state. The 4f electronic exchange constant and Pr-141 nuclear order temperature were estimated to be 0.64K in the temperature unit and 0.13 mK, respectively, from the Pr-141 nuclear spin fluctuation frequency 5.8(2) MHz at 0.1 K.

• 出版日期2011-11