Nature of the Unconventional Heavy-Fermion Kondo State in Monolayer CeSiI
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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2024-04-10
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en
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7
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Nano Letters, Volume 24, issue 14, pp. 4272-4278
Abstract
CeSiI has been recently isolated in the ultrathin limit, establishing CeSiI as the first intrinsic two-dimensional van der Waals heavy-fermion material up to 85 K. We show that, due to the strong spin–orbit coupling, the local moments develop a multipolar real-space magnetic texture, leading to local pseudospins with a nearly vanishing net moment. To elucidate its Kondo-screened regime, we extract from first-principles the parameters of the Kondo lattice model describing this material. We develop a pseudofermion methodology in combination with ab initio calculations to reveal the nature of the heavy-fermion state in CeSiI. We analyze the competing magnetic interactions leading to an unconventional heavy-fermion order as a function of the magnetic exchange between the localized f-electrons and the strength of the Kondo coupling. Our results show that the magnetic exchange interactions promote an unconventional momentum-dependent Kondo-screened phase, establishing the nature of the heavy-fermion state observed in CeSiI.Description
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quantum magnetism, van der Waals materials, 2D materials, heavy-fermion materials, Kondo lattice, ab initio methods
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Otero Fumega, A & Lado, J 2024, ' Nature of the Unconventional Heavy-Fermion Kondo State in Monolayer CeSiI ', Nano Letters, vol. 24, no. 14, pp. 4272-4278 . https://doi.org/10.1021/acs.nanolett.4c00619