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The nature of multipolar order and hyperfine-enhanced (HE) $^{141}$Pr nuclearspin dynamics in PrV$_2$Al$_{20}$ was investigated using the muon spinrelaxation technique. No explicit sign of time-reversal symmetry breaking wasfound below the multipolar order temperature $T_Q\sim 0.6$ K in a zero appliedfield as anticipated on the basis of the antiferroquadrupolar (AFQ) orderpicture proposed by Sakai and Nakatsuji [J. Phys. Soc. Jpn. 80, 063701 (2011)].Further evidence of the nonmagnetic ground state was obtained from theobservation of HE $^{141}$Pr nuclear spin fluctuations in the MHz scale. Amarked increase in the muon spin-lattice relaxation rate (1/$T_{\rm 1,\mu}$)was observed below 1 K with decreasing temperature, which was attributed to theperturbation on the HE $^{141}$Pr nuclear spin dynamics associated with thedevelopment of AFQ correlations. The longitudinal field dependence of 1/$T_{\rm  1,\mu}$ revealed that the enhanced $^{141}$Pr nuclear spin accidentally hasan effective gyromagnetic ratio close to that of the muon.

Perturbation on Hyperfine-enhanced $^{141}$Pr Nuclear Spin Dynamics Associated with Antiferroquadrupolar Order in PrV$_2$Al$_{20}$