Two-dimensional heavy fermion in a monoatomic-layer Kondo lattice YbCu2
Takuto Nakamura (),
Hiroki Sugihara,
Yitong Chen,
Ryu Yukawa,
Yoshiyuki Ohtsubo,
Kiyohisa Tanaka,
Miho Kitamura,
Hiroshi Kumigashira and
Shin-ichi Kimura ()
Additional contact information
Takuto Nakamura: Osaka University
Hiroki Sugihara: Osaka University
Yitong Chen: Osaka University
Ryu Yukawa: Osaka University
Yoshiyuki Ohtsubo: National Institutes for Quantum Science and Technology
Kiyohisa Tanaka: Institute for Molecular Science
Miho Kitamura: High Energy Accelerator Research Organization (KEK)
Hiroshi Kumigashira: Tohoku University
Shin-ichi Kimura: Osaka University
Nature Communications, 2023, vol. 14, issue 1, 1-7
Abstract:
Abstract 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.
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-43662-9
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DOI: 10.1038/s41467-023-43662-9
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