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Muon spin relaxation and hyperfine-enhanced $$^{141}$$Pr nuclear spin dynamics in Pr(Os,Ru)$$_4$$Sb$$_{12}$$ and (Pr,La)Os$$_4$$Sb$$_{12}$$

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

Zero- and longitudinal-field muon spin relaxation experiments have been carried out in the alloy series Pr(Os$$_{1-x}$$Ru$$_x$$)$$_4$$Sb$$_{12}$$ and Pr$$_{1-y}$$La$$_y$$Os$$_4$$Sb$$_{12}$$ to elucidate the anomalous dynamic muon spin relaxation observed in these materials. The damping rate $$Lambda$$ associated with this relaxation varies with temperature, applied magnetic field, and dopant concentrations $$x$$ and $$y$$ in a manner consistent with the "hyperfine enhancement" of $$^{141}$$Pr nuclear spins. This mechanism arises from Van Vleck-like admixture of magnetic Pr$$^{3+}$$ crystalline-electric-field-split excited states into the nonmagnetic singlet ground state by the nuclear hyperfine coupling, thereby increasing the strengths of spin-spin interactions between $$^{141}$$Pr and muon spins and within the $$^{141}$$Pr spin system. We find qualitative agreement with this scenario and conclude that electronic spin fluctuations are not directly involved in the dynamic muon spin relaxation.



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Category:Materials Science, Multidisciplinary



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