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$$mu$$SR evidence of nonmagnetic order and $$^{141}$$Pr hyperfine-enhanced nuclear magnetism in the cubic $$Gamma_3$$ ground doublet system PrTi$$_2$$Al$$_{20}$$

Ito, Takashi; Higemoto, Wataru; Ninomiya, Kazuhiko; Luetkens, H.*; Baines, C.*; Sakai, Akito*; Nakatsuji, Satoru*

A muon spin relaxation ($$mu$$SR) study of the cubic $$Gamma_3$$ ground doublet system PrTi$$_2$$Al$$_{20}$$ is presented. The zero-field $$mu$$SR rate shows no significant change while passing through the phase transition temperature $$T_{rm O}$$ = 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 $$T_{rm O}$$, ascribed to $$^{141}$$Pr hyperfine-enhanced nuclear magnetism in the nonmagnetic ground state. The $$4f$$ 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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Category:Physics, Multidisciplinary

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