Abstract
We performed muon spin rotation and relaxation ($\ensuremath{\mu}$SR) measurements in the caged-structure heavy-fermion system PrIr${}_{2}$Zn${}_{20}$ to elucidate its magnetic and superconducting properties. Temperature-independent $\ensuremath{\mu}$SR spectra were observed below 1 K, indicating that the phase transition at 0.11 K is of a nonmagnetic origin, most probably pure quadrupole ordering. In the superconducting phase, no sign of unconventional superconductivity, such as superconductivity with broken time-reversal symmetry, was seen below ${T}_{c}=0.05$ K. We also observed spontaneous muon spin precession in zero field in the paramagnetic phase below 15 K, suggesting that unusual coupling between ${}^{141}$Pr nuclei and muons is realized in PrIr${}_{2}$Zn${}_{20}$.
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