μSR Studies on Caged Compound PrIr2Zn20

We have performed muon spin rotation and relaxation experiments in caged compound PrIr2Zn20 with the non magnetic Γ3 doublet state at J-PARC MUSE to elucidate the magnetic state. In the paramagnetic phase, we have observed a spontaneous muon spin precession, even in a zero field. This result suggests that a novel coupling between 141Pr nuclei and muon is formed in PrIr2Zn20.