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Time reversal symmetry breaking in superconducting (Pr,La)Os$$_4$$Sb$$_{12}$$ and Pr(Os,Ru)$$_4$$Sb$$_{12}$$

Shu, L.*; Higemoto, Wataru  ; Aoki, Yuji*; Frederick, N. A.*; Yuhasz, W. M.*; Heffner, R. H.; Oishi, Kazuki; Ishida, Kenji*; Kadono, Ryosuke*; Koda, Akihiro*; Kikuchi, Daisuke*; Sato, Hideyuki*; Sugawara, Hitoshi*; Ito, Takashi   ; Sanada, Shotaro*; Tsunashima, Yoshino*; Yonezawa, Yuki*; Maple, M. B.*; MacLaughlin, D. E.*

Zero-field muon spin relaxation ($$mu$$SR) experiments have been carried out in the Pr(Os$$_{1-x}$$Ru$$_x$$)$$_4$$Sb$$_{12}$$ and Pr$$_{1-y}$$La$$_y$$Os$$_4$$Sb$$_{12}$$ alloy systems to investigate the time-reversal symmetry (TRS) breaking found in an earlier ZF-$$mu$$SR study of the end compound PrOs$$_4$$Sb$$_{12}$$. Our results suggest that Ru doping is considerably more efficient than La doping in suppressing TRS-breaking superconducting pairing in PrOs$$_4$$Sb$$_{12}$$.

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