Temperature dependence of the Kondo resonance in the photoemission spectra of the heavy-fermion compounds 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Yb</mml:mi><mml:mi>X</mml:mi><mml:msub><mml:mi>Cu</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:mspace width="0.28em" /><mml:mrow><mml:mo>(</mml:mo><mml:mi>X</mml:mi><mml:mo>=</mml:mo><mml:mrow><mml:mi>Mg</mml:mi><mml:mo>,</mml:mo><mml:mspace width="0.28em" /><mml:mi>Cd</mml:mi><mml:mo>,</mml:mo><mml:mspace width="0.28em" /><mml:mi

Anzai, H.; Morikawa, Kohei; Shiono, Hiroto; Sato, Hitoshi; Ideta, S.; Tanaka, Kiyohisa; Zhuang, Tao; Matsumoto, Kunihiro; Hiraoka, Koichi

doi:10.1103/physrevb.101.235160

Cited by 8 publications

(3 citation statements)

References 36 publications

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“…4d, e . The peak position shifts from 42 meV to 22 meV with decreasing temperature and is saturated at 30 K. The integrated intensity increases with decreasing temperature and is also saturated at 30 K. According to photoelectron spectroscopic studies of bulk RE intermetallic compounds, such saturated temperature represents a coherence temperature ( T c o h ), at which the c - f hybridization state is fully established, resulting in a HF state 38 , 39 . T c o h sets the temperature scale on which the weight increases and saturation typically occurs below T c o h .…”

Section: Resultsmentioning

confidence: 99%

Two-dimensional heavy fermion in a monoatomic-layer Kondo lattice YbCu2

Nakamura,

Sugihara,

Chen

et al. 2023

Nat Commun

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The Kondo effect between localized f-electrons and conductive carriers leads to exotic physical phenomena. Among them, heavy-fermion (HF) systems, in which massive effective carriers appear due to the Kondo effect, have fascinated many researchers. Dimensionality is also an important characteristic of the HF system, especially because it is strongly related to quantum criticality. However, the realization of the perfect two-dimensional (2D) HF materials is still a challenging topic. Here, we report the surface electronic structure of the monoatomic-layer Kondo lattice YbCu2 on a Cu(111) surface observed by synchrotron-based angle-resolved photoemission spectroscopy. The 2D conducting band and the Yb 4f state, located very close to the Fermi level, are observed. These bands are hybridized at low-temperature, forming the 2D HF state, with an evaluated coherence temperature of about 30 K. The effective mass of the 2D state is enhanced by a factor of 100 by the development of the HF state. Furthermore, clear evidence of the hybridization gap formation in the temperature dependence of the Kondo-resonance peak has been observed below the coherence temperature. Our study provides a new candidate as an ideal 2D HF material for understanding the Kondo effect at low dimensions.

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Section: Resultsmentioning

confidence: 99%

Two-dimensional heavy fermion in a monoatomic-layer Kondo lattice YbCu2

Nakamura,

Sugihara,

Chen

et al. 2023

Nat Commun

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“…Tv obtained by fitting the data from refs [19,33,[35][36][37][38][39] to Equation (1). T K reproduced from refs [13,19,35,38,[40][41][42][43].…”

Section: Discussionmentioning

confidence: 99%

Intermediate Valence State in $\mathrm{YbB_4}$ Revealed by Resonant X-ray Emission Spectroscopy

Frontini,

Lebert,

Cho

et al. 2022

Preprint

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We report the temperature dependence of the Yb valence in the geometrically frustrated compound YbB 4 from 12 to 300 K using resonant X-ray emission spectroscopy at the Yb Lα 1 transition. We find that the Yb valence, v, is hybridized between the v = 2 and v = 3 valence states, increasing from v = 2.61 ± 0.01 at 12 K to v = 2.67 ± 0.01 at 300 K, confirming that YbB 4 is a Kondo system in the intermediate valence regime. This result indicates that the Kondo interaction in YbB 4 is substantial, and is likely to be the reason why YbB 4 does not order magnetically at low temperature, rather than this being an effect of geometric frustration. Furthermore, the zero-point valence of the system is extracted from our data and compared with other Kondo lattice systems. The zero-point valence seems to be weakly dependent on the Kondo temperature scale, but not on the valence change temperature scale Tv.

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“…Errorbars correspond to the model uncertainty. T K reproduced from [13,19,35,38,[40][41][42][43][44].…”

Section: Discussionmentioning

confidence: 99%

Intermediate valence state in YbB₄ revealed by resonant x-ray emission spectroscopy

Frontini

Lebert

Cho

et al. 2022

J. Phys.: Condens. Matter

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We report the temperature dependence of the Yb valence in the geometrically frustrated compound YbB4 from 12 to 300 K using resonant X-ray emission spectroscopy at the Yb Lα1 transition. We find that the Yb valence, v, is hybridized between the v = 2 and v = 3 valence states, increasing from v = 2.61 ± 0.01 at 12 K to v = 2.67 ± 0.01 at 300 K, confirming that YbB4 is a Kondo system in the intermediate valence regime. This result indicates that the Kondo interaction in YbB4 is substantial, and is likely to be the reason why YbB4 does not order magnetically at low temperature, rather than this being an effect of geometric frustration. Furthermore, the zero-point valence of the system is extracted from our data and compared with other Kondo lattice systems. The zero-point valence seems to be weakly dependent on the Kondo temperature scale, but not on the valence change temperature scale Tv.

show abstract

Temperature dependence of the Kondo resonance in the photoemission spectra of the heavy-fermion compounds YbXCu4(X=Mg,Cd,

Cited by 8 publications

References 36 publications

Two-dimensional heavy fermion in a monoatomic-layer Kondo lattice YbCu2

Two-dimensional heavy fermion in a monoatomic-layer Kondo lattice YbCu2

Intermediate Valence State in $\mathrm{YbB_4}$ Revealed by Resonant X-ray Emission Spectroscopy

Intermediate valence state in YbB₄ revealed by resonant x-ray emission spectroscopy

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Temperature dependence of the Kondo resonance in the photoemission spectra of the heavy-fermion compounds YbXCu4(X=Mg,Cd,

Cited by 8 publications

References 36 publications

Two-dimensional heavy fermion in a monoatomic-layer Kondo lattice YbCu2

Two-dimensional heavy fermion in a monoatomic-layer Kondo lattice YbCu2

Intermediate Valence State in $\mathrm{YbB_4}$ Revealed by Resonant X-ray Emission Spectroscopy

Intermediate valence state in YbB4 revealed by resonant x-ray emission spectroscopy

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Product

Resources

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Intermediate valence state in YbB₄ revealed by resonant x-ray emission spectroscopy