Abrupt change in hybridization gap at the valence transition of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Yb</mml:mi><mml:mi>In</mml:mi><mml:msub><mml:mi>Cu</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>

Mott physics plays a critical role in materials with strong electronic correlations. Mott insulator-to-metal transition can be driven by chemical doping, external pressure, temperature and gate voltage, which is often seen in transition metal oxides with 3d electrons near the Fermi energy (e.g. cuprate superconductor). In 4f-electron system, however, the insulator-to-metal transition is mostly driven by Kondo hybridization and the Mott physics has rarely been explored in experiments. Here, by combining the angle-resolved photoemission spectroscopy and strongly correlated band structure calculations, we show that an unusual Mott instability exists in YbInCu4 accompanying its mysterious first-order valence transition. This contrasts with the prevalent Kondo picture and demonstrates that YbInCu4 is a unique platform to explore the Mott physics in Kondo lattice systems. Our work provides important insight for the understanding and manipulation of correlated quantum phenomena in the f-electron system.

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Observation of Mott instability at the valence transition of f-electron system

Yang

Gao

Cao

et al. 2023

National Science Review

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Observation of temperature-dependent Fermi surface evolution at the valence transition of YbInCu4

et al. 2023

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Photoemission Spectroscopy Study on the Heavy-Fermion Compound YbAgCu₄

et al. 2022

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Abrupt change in hybridization gap at the valence transition ofYbInCu4

Cited by 3 publications

References 31 publications

Observation of Mott instability at the valence transition of f-electron system

Observation of Mott instability at the valence transition of f-electron system

Observation of temperature-dependent Fermi surface evolution at the valence transition of YbInCu4

Photoemission Spectroscopy Study on the Heavy-Fermion Compound YbAgCu₄

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Abrupt change in hybridization gap at the valence transition ofYbInCu4

Cited by 3 publications

References 31 publications

Observation of Mott instability at the valence transition of f-electron system

Observation of Mott instability at the valence transition of f-electron system

Observation of temperature-dependent Fermi surface evolution at the valence transition of YbInCu4

Photoemission Spectroscopy Study on the Heavy-Fermion Compound YbAgCu4

Contact Info

Product

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Photoemission Spectroscopy Study on the Heavy-Fermion Compound YbAgCu₄