Nature of the unconventional heavy fermion Kondo state in monolayer CeSiI
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arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866917718742007808 |
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| author | Fumega, Adolfo O. Lado, Jose L. |
| author_facet | Fumega, Adolfo O. Lado, Jose L. |
| contents | 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 Ce 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 fractional pseudofermion methodology in combination with ab initio calculations to reveal the nature of the Kondo-screened heavy fermion state in CeSiI. Using this formalism, we analyze the competing magnetic interactions leading to a 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 heavy-fermion Kondo screened phase, establishing the nature of the heavy-fermion behavior of ultrathin CeSiI observed experimentally. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_10855 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Nature of the unconventional heavy fermion Kondo state in monolayer CeSiI Fumega, Adolfo O. Lado, Jose L. Strongly Correlated Electrons Mesoscale and Nanoscale Physics Materials Science 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 Ce 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 fractional pseudofermion methodology in combination with ab initio calculations to reveal the nature of the Kondo-screened heavy fermion state in CeSiI. Using this formalism, we analyze the competing magnetic interactions leading to a 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 heavy-fermion Kondo screened phase, establishing the nature of the heavy-fermion behavior of ultrathin CeSiI observed experimentally. |
| title | Nature of the unconventional heavy fermion Kondo state in monolayer CeSiI |
| topic | Strongly Correlated Electrons Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2401.10855 |