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論文

Quantum critical spin-liquid-like behavior in the $$S$$ = $$frac{1}{2}$$ quasikagome-lattice compound CeRh$$_{1-x}$$Pd$$_x$$Sn investigated using muon spin relaxation and neutron scattering

Tripathi, R.*; Adroja, D. T.*; Ritter, C.*; Sharma, S.*; Yang, C.*; Hillier, A. D.*; Koza, M. M.*; Demmel, F.*; Sundaresan, A.*; Langridge, S.*; et al.

Physical Review B, 106(6), p.064436_1 - 064436_17, 2022/08

https://doi.org/10.1103/PhysRevB.106.064436
 被引用回数：2 パーセンタイル：34.67(Materials Science, Multidisciplinary)

We present the results of muon spin relaxation ($$mu$$SR) and neutron scattering measurements on the Ce-based quasikagome lattice CeRh$$_{1-x}$$Pd$$_x$$Sn ($$x$$ = 0.1 to 0.75). Our $$mu$$SR results reveal the absence of both static long-range magnetic order and spin freezing down to 0.05 K in the $$x$$ = 0.1 sample, which is consistent with neutron scattering results. The weak temperature-dependent plateaus of the dynamic spin fluctuations below 0.2 K in zero field together with its longitudinal-field (LF) dependence indicate the presence of dynamic spin fluctuations persisting even at 0.05 K without static magnetic order. We argue that such a behavior for $$x$$ = 0.1 can be attributed to a metallic spin-liquid-like ground state near the quantum critical point in the frustrated Kondo lattice. The LF-$$mu$$SR study suggests that the out of kagome plane spin fluctuations are responsible for the spin-liquid behavior.

論文

Suppression of time-reversal symmetry breaking superconductivity in Pr(Os$$_{1-x}$$Ru$$_x$$)$$_4$$Sb$$_{12}$$ and Pr$$_{1-y}$$La$$_y$$Os$$_4$$Sb$$_{12}$$

Shu, L.*; 髭本 亘; 青木 勇二*; Hillier, A. D.*; 大石 一城*; 石田 憲二*; 門野 良典*; 幸田 章宏*; Bernal, O. O.*; MacLaughlin, D. E.*; et al.

Physical Review B, 83(10), p.100504_1 - 100504_4, 2011/03

https://doi.org/10.1103/PhysRevB.83.100504
 被引用回数：34 パーセンタイル：77.76(Materials Science, Multidisciplinary)

時間反転対称性(TRS)の破れた超伝導状態について調べるため、Pr(Os$$_{1-x}$$Ru$$_x$$)$$_4$$Sb$$_{12}$$とPr$$_{1-y}$$La$$_y$$Os$$_4$$Sb$$_{12}$$合金において零磁場ミュオンスピン緩和測定を行った。TRSは自発的な局所磁場の発生で知ることができる。両合金において磁場は最初は減少したが、Ru置換系ではLa置換系に比べて50%速い現象がみられた。この結果から、TRSは$$xgeq 0.6$$で抑制されるが、La置換系ではすべての濃度において残ることが明らかになった。この結果は結晶場励起子によるクーパー対形成によるTRSの破れた超伝導機構を支持するものである。

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.

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