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$$mu$$SR in CeRu$$_{2}$$Al$$_{10}$$

Kambe, Shinsaku ; Chudo, Hiroyuki ; Tokunaga, Yo ; Koyama, Takehide*; Sakai, Hironori  ; Ito, Takashi  ; Ninomiya, Kazuhiko; Higemoto, Wataru ; Nishioka, Takashi*; Takesaka, Tomoaki*; Miyake, Yasuhiro*

We report zero-field $$mu^+$$SR measurements made at J-PARC on CeRu$$_{2}$$Al$$_{10}$$. Below the phase transition temperature $$T_0sim27$$K, a clear modulation of $$mu^+$$ polarization due to an internal field is observed, indicating that magnetic ordering takes place. Compared with the internal field expected from the effective magnetic moment in the disordered state, the observed internal field at the $$mu^+$$ site is quite small. This indicates that the ordered Ce magnetic moment is small ($$sim10^{-2}mu_B$$) and/or the nearest pair of Ce magnetic moments are mutually anti-parallel. The $$T$$-dependence of the internal field is somewhat peculiar, suggesting that another ordering is taking place as well.

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