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Multipole and superconducting state in PrIr$$_2$$Zn$$_{20}$$ probed by muon spin relaxation

Higemoto, Wataru; Ito, Takashi; Ninomiya, Kazuhiko; Onimaru, Takahiro*; Matsumoto, Keisuke*; Takabatake, Toshiro*

We performed muon spin rotation and relaxation measurements ($$mu$$SR) in caged structural heavy fermion system PrIr$$_2$$Zn$$_{20}$$ to elucidate magnetic and superconducting properties. Temperature independent $$mu$$SR spectra were observed below 1K, indicating that the phase transition at 0.11K is non-magnetic origin, most probably pure quadrupole ordering. In the superconducting phase, no sign of unconventional superconductivity, like a broken time reversal symmetry superconductivity, is seen below $$T_c$$=0.05K. Moreover, we have observed spontaneous muon spin precession in a zero field in the paramagnetic phase below 15K, suggesting a novel coupling between $$^{141}$$Pr nuclei and muon realize in PrIr$$_2$$Zn$$_{20}$$.

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Category:Materials Science, Multidisciplinary

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