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Perturbation on hyperfine-enhanced $$^{141}$$Pr nuclear spin dynamics associated with antiferroquadrupolar order in PrV$$_2$$Al$$_{20}$$

PrV$$_2$$Al$$_{20}$$における反強四極子秩序に関連した$$^{141}$$Pr増強核磁性への摂動

伊藤 孝; 髭本 亘; 酒井 明人*; 中辻 知*; 辻本 真規*

Ito, Takashi; Higemoto, Wataru; Sakai, Akito*; Nakatsuji, Satoru*; Tsujimoto, Masaki*

The nature of multipolar order and hyperfine-enhanced (HE) $$^{141}$$Pr nuclear spin dynamics in PrV$$_2$$Al$$_{20}$$ was investigated using the muon spin relaxation technique. No explicit sign of time-reversal symmetry breaking was found below the multipolar order temperature $$T_Qsim 0.6$$K in a zero applied field as anticipated on the basis of the antiferroquadrupolar (AFQ) order picture proposed by Sakai and Nakatsuji [J. Phys. Soc. Jpn. ${bf 80}$, 063701 (2011)]. Further evidence of the nonmagnetic ground state was obtained from the observation of HE $$^{141}$$Pr nuclear spin fluctuations in the MHz scale. A marked increase in the muon spin-lattice relaxation rate (1/$$T_{rm 1,mu}$$) was observed below 1K with decreasing temperature, which was attributed to the perturbation on the HE $$^{141}$$Pr nuclear spin dynamics associated with the development of AFQ correlations.

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パーセンタイル:83.81

分野:Materials Science, Multidisciplinary

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