$\mathrm{F}{\mathrm{e}}_3\mathrm{GeT}{\mathrm{e}}_2$: A site-differentiated Hund metal

Abstract

Magnetism in two-dimensional (2D) van der Waals (vdW) materials has lately attracted considerable attention from the point of view of both fundamental science and device applications. Obviously, establishing the detailed and solid understanding of their magnetism is the key first step toward various applications. Although $\mathrm{F}{\mathrm{e}}_3\mathrm{GeT}{\mathrm{e}}_2$ is a representative ferromagnetic (FM) metal in this family, many aspects of its magnetic and electronic behaviors still remain elusive. Here, we report our new finding that $\mathrm{F}{\mathrm{e}}_3\mathrm{GeT}{\mathrm{e}}_2$ is a special type of correlated metal known as 'Hund metal'. Furthermore, we demonstrate that Hund metallicity in this material is quite unique by exhibiting remarkable site-dependence of Hund correlation strength, hereby dubbed 'site-differentiated Hund metal'. Within this new picture, many of previous experiments can be clearly understood including the ones that were seemingly contradictory to one another.

8 pages, 3 figures

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• Electronic correlations in the van der Waals ferromagnet Fe${}_3$GeTe${}_2$ revealed by its charge dynamics
• Hund physics landscape of two-orbital system

Cited by in corpus (13)

• Spectral Evidence for Local-Moment Ferromagnetism in van der Waals Metals Fe${}_3$GaTe${}_2$ and Fe${}_3$GeTe${}_2$
• Heavy-fermions in frustrated Hund's metal with portions of incipient flat-bands
• 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${}_2$
• Universal Superconductivity in FeTe and All-Iron-Based Ferromagnetic Superconductor Heterostructures
• First-principles Hubbard parameters with automated and reproducible workflows
• An effective spin model on the honeycomb lattice for the description of magnetic properties in two-dimensional Fe${}_3$GeTe${}_2$
• Manifestation of incoherent-coherent crossover and non-Stoner magnetism in the electronic structure of Fe${}_3$GeTe${}_2$
• Frozen spin ratio and the detection of Hund correlations
• Layer-dependent spin-resolved electronic structure of ferromagnetic triple-layered ruthenate Sr${}_4$Ru${}_3$O${}_{10}$
• Electronic structures and magnetism in van der Waals flat-band material Ni${}_3$GeTe${}_2$
• Site-polarized Mott phases competing with a correlated metal in twisted WSe${}_2$
• Signatures of Kondo-lattice behavior in the two-dimensional ferromagnet Fe${}_3$GeTe${}_2$