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論文

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.*; 青木 勇二*; 綱島 慶乃*; 米澤 祐樹*; 真田 祥太郎*; 菊地 大輔*; 佐藤 英行*; Heffner, R. H.; 髭本 亘; et al.

Physical Review B, 76(1), p.014527_1 - 014527_8, 2007/07

https://doi.org/10.1103/PhysRevB.76.014527
 被引用回数：21 パーセンタイル：64.75(Materials Science, Multidisciplinary)

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.

論文

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

Shu, L.*; 髭本 亘; 青木 勇二*; Frederick, N. A.*; Yuhasz, W. M.*; Heffner, R. H.; 大石 一城; 石田 憲二*; 門野 良典*; 幸田 章宏*; et al.

Journal of Magnetism and Magnetic Materials, 310(2, Part1), p.551 - 553, 2006/11

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$$_{12}$$.

論文

Penetration depth study in the heavy-fermion superconductor PrOs$$_4$$Sb$$_{12}$$

Shu, L.*; MacLaughlin, D. E.*; Heffner, R. H.; Callaghan, F. D.*; Sonier, J. E.*; Morris, G. D.*; Bernal, O. O.*; Bosse, A.*; Anderson, J. E.*; Yuhasz, W. M.*; et al.

Physica B; Condensed Matter, 374-375, p.247 - 250, 2006/01

https://doi.org/10.1016/j.physb.2005.11.066
 被引用回数：6 パーセンタイル：31.23(Physics, Condensed Matter)

The penetration depth $$lambda$$ in the filled-skutterudite heavy-fermion superconductor PrOs$$_4$$Sb$$_{12}$$ has been measured using transverse-field muon spin rotation (TF-$$mu$$SR). It is found to be temperature-independent at low temperatures, consistent with a nonzero gap for point nodes in the gap. A $$sim$$10$$%$$ discrepancy is found at low temperatures. This may be due to mechanisms that modify the vortex-state field distribution, or to the surface scattering which breaks pairs in an odd-parity superconductor. Alternatively, it may be a matter of field orientation of nodal gap structure in the $$mu$$SR measurements.

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