Mixed-valence state of the rare-earth compounds 
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 = Mg, Cd, In, and Sn): Magnetic susceptibility, x-ray diffraction, and x-ray absorption spectroscopy investigations

Anzai, H.; Ishihara, Suzuna; Shiono, Hiroto; Morikawa, Kohei; Iwazumi, Toshiaki; Sato, Hitoshi; Zhuang, Tao; Matsumoto, Keisuke; Hiraoka, Koichi

doi:10.1103/physrevb.100.245124

Cited by 7 publications

(1 citation statement)

References 26 publications

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“…For some recent examples, in Ba 3 InIr 2 O 9 it shows some quantum spin-liquid behaviors [11] caused by the mixed valence of Ir. In YbXCu 4 for different X = Mg, Cd, In, and Sn, 5p electrons of X atoms can control the mixed-valence state of Yb 4 f electrons and thus affect the Kondo temperature which are in a range from 25 K up to 1109 K calculated from the Wilsons formula with the zero-temperature susceptibility [12]. Especially, largely due to the emergence of both the Kondo correlation and mixed valence in the mixed valence topological Kondo insulators SmB 6 , there spring out a lot of debates [13].…”

Section: Introductionmentioning

confidence: 99%

Study the mixed valence problem in asymmetric Anderson model: Fano–Kondo resonance around Fermi level

Li¹,

Cheng²,

Zheng³

et al. 2022

J. Phys.: Condens. Matter

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We numerically calculate the local density of states in asymmetric Anderson model in mixed valence regime using hierarchical equations of motion approach. Based on the idea that the asymmetric line shape of local density of states around Fermi level stems from the interference between the single particle resonance and the Kondo resonance, we perform a fitting. From the fitting results, we obtain the Kondo temperatures and the Fano factors with changing the single particle energy. The tendency of Kondo temperature agrees with the previous analytic expressions and the Fano factors are in an expected variation of Fano resonance. Our study shows that the Fano--Kondo resonance can reasonably explain the asymmetric line shape of the local density of states around the Fermi level.

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Section: Introductionmentioning

confidence: 99%

Study the mixed valence problem in asymmetric Anderson model: Fano–Kondo resonance around Fermi level

Li¹,

Cheng²,

Zheng³

et al. 2022

J. Phys.: Condens. Matter

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Large thermopower in novel thermoelectric Yb(Si1−xGex)2 induced by valence fluctuation

Nishide

Tanusilp

Kowa

et al. 2022

Journal of Applied Physics

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Ytterbium silicide-based thermoelectric materials have attracted attention because they exhibit large power factors owing to large absolute values of their Seebeck coefficient as well as high electrical conductivity. Here, we demonstrate that, in the Yb(Si1− xGe x)2 system, by controlling the valence fluctuation, we combine two phenomena, namely, the Kondo effect and suppression of the spin fluctuation. This leads to a large density of states and the suppression of the spin fluctuation of the 4 f electrons, thereby resulting in a high Seebeck coefficient with extremely low resistivity. Consequently, Yb(Si0.5Ge0.5)2 exhibits a high-power factor of 8.4 mW K−2 m−1, which makes energy harvesting from a cold source a practical possibility.

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Temperature dependence of the Kondo resonance in the photoemission spectra of the heavy-fermion compounds YbXCu4(X=Mg,Cd,
Anzai
¹
,
Morikawa
²
,
Shiono
³

et al. 2020
Phys. Rev. B
8
0
3
0
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Mixed-valence state of the rare-earth compounds YbXCu4 ( X = Mg, Cd, In, and Sn): Magnetic susceptibility, x-ray diffraction, and x-ray absorption spectroscopy investigations

Cited by 7 publications

References 26 publications

Study the mixed valence problem in asymmetric Anderson model: Fano–Kondo resonance around Fermi level

Study the mixed valence problem in asymmetric Anderson model: Fano–Kondo resonance around Fermi level

Large thermopower in novel thermoelectric Yb(Si1−xGex)2 induced by valence fluctuation

Temperature dependence of the Kondo resonance in the photoemission spectra of the heavy-fermion compounds YbXCu4(X=Mg,Cd,
Anzai
¹
,
Morikawa
²
,
Shiono
³

et al. 2020
Phys. Rev. B
8
0
3
0
View full text Add to dashboard Cite

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Mixed-valence state of the rare-earth compounds YbXCu4 ( X = Mg, Cd, In, and Sn): Magnetic susceptibility, x-ray diffraction, and x-ray absorption spectroscopy investigations

Cited by 7 publications

References 26 publications

Study the mixed valence problem in asymmetric Anderson model: Fano–Kondo resonance around Fermi level

Study the mixed valence problem in asymmetric Anderson model: Fano–Kondo resonance around Fermi level

Large thermopower in novel thermoelectric Yb(Si1−xGex)2 induced by valence fluctuation

Temperature dependence of the Kondo resonance in the photoemission spectra of the heavy-fermion compounds YbXCu4(X=Mg,Cd,Anzai1, Morikawa2, Shiono3 et al. 2020Phys. Rev. B8030View full textAdd to dashboardCite

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Temperature dependence of the Kondo resonance in the photoemission spectra of the heavy-fermion compounds YbXCu4(X=Mg,Cd,
Anzai
¹
,
Morikawa
²
,
Shiono
³

et al. 2020
Phys. Rev. B
8
0
3
0
View full text Add to dashboard Cite