Kondo Holes in the Two-Dimensional Itinerant Ising Ferromagnet Fe<sub>3</sub>GeTe<sub>2</sub>.
basic_science · Level V
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- Record sourced from PubMed, PMID 34279960.
- Also identified by DOI 10.1021/acs.nanolett.1c01661.
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Abstract
Heavy Fermion (HF) states emerge in correlated quantum materials due to the intriguing interplay between localized magnetic moments and itinerant electrons but rarely appear in 3d-electron systems due to high itinerancy of d-electrons. Here, an anomalous enhancement of Kondo screening is observed at the Kondo hole of local Fe vacancies in Fe<sub>3</sub>GeTe<sub>2</sub> which is a recently discovered 3d-HF system featuring Kondo lattice and two-dimensional itinerant ferromagnetism. An itinerant Kondo-Ising model is established to reproduce the experimental results and provides insight into the competition between Ising ferromagnetism and Kondo screening. Our work explains the microscopic origin of the d-electron HF states in Fe<sub>3</sub>GeTe<sub>2</sub> and inspires future studies of the enriched quantum many-body effects with Kondo holes.