Kondo holes in the 2D itinerant Ising ferromagnet Fe3GeTe2

Abstract

Heavy fermion (HF) states emerge in correlated quantum materials due to the 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 Fe3GeTe2 which is a recently discovered 3d-HF system featuring of Kondo lattice and two-dimensional itinerant ferromagnetism. An itinerant Kondo-Ising model is established to reproduce the experimental results which provides insight of the competition between Ising ferromagnetism and Kondo screening. This work explains the microscopic origin of the d-electron HF states and inspires study of the enriched quantum many-body phenomena with Kondo holes in Ising ferromagnets.

arXiv comment17 Pages, 4 Figures

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• Neutron spectroscopy evidence on the dual nature of magnetic excitations in a van der Waals metallic ferromagnet Fe${}_{2.72}$GeTe${}_2$
• Antiferromagnetic fluctuations and orbital-selective Mott transition in the van der Waals ferromagnet Fe3-xGeTe2
• Enhanced $d$-$p$ hybridization intertwined with anomalous ground state formation in van der Waals-coupled magnetic metal Fe${}_5$GeTe${}_2$
• Mechanism of magnetic phase transition in correlated magnetic metal: insight into itinerant ferromagnet Fe${}_{3-\delta }$GeTe${}_2$
• DFT+DMFT investigation of the magnetic phase transition in the itinerant ferromagnet Fe${}_3$GaTe${}_2$
• Electron transport and scattering mechanisms in ferromagnetic monolayer Fe${}_3$GeTe${}_2$
• Epitaxial growth of bilayer Bi(110) on two-dimensional ferromagnetic Fe3GeTe2
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• Manifestation of incoherent-coherent crossover and non-Stoner magnetism in the electronic structure of Fe${}_3$GeTe${}_2$
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• Electronic structures and magnetism in van der Waals flat-band material Ni${}_3$GeTe${}_2$
• Magnon Damping as a Probe of Kondo Coupling in Magnetically Ordered Systems
• Scanning Tunneling Microscopy Study of Epitaxial Fe3GeTe2 Monolayers on Bi2Te3
• Signatures of Kondo-lattice behavior in the two-dimensional ferromagnet Fe${}_3$GeTe${}_2$