Electronic and magnetic characterization of epitaxial CrBr${}_3$ monolayers

Abstract

The ability to imprint a given material property to another through proximity effect in layered two-dimensional materials has opened the way to the creation of designer materials. Here, we use molecular-beam epitaxy (MBE) for a direct synthesis of a superconductor-magnet hybrid heterostructure by combining superconducting niobium diselenide (NbSe${}_2$) with the monolayer ferromagnetic chromium tribromide (CrBr${}_3$). Using different characterization techniques and density-functional theory (DFT) calculations, we have confirmed that the CrBr${}_3$ monolayer retains its ferromagnetic ordering with a magnetocrystalline anisotropy favoring an out-of-plane spin orientation. Low-temperature scanning tunneling microscopy (STM) measurements show a slight reduction of the superconducting gap of NbSe${}_2$ and the formation of a vortex lattice on the CrBr${}_3$ layer in experiments under an external magnetic field. Our results contribute to the broader framework of exploiting proximity effects to realize novel phenomena in 2D heterostructures.

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• Electronic and magnetic characterization of epitaxial CrBr${}_3$ monolayers
• Progress and Prospects in Two-Dimensional Magnetism of van der Waals Materials
• Family of Two Dimensional Transition Metal Dichlorides Fundamental Properties, Structural Defects, and Environmental Stability
• Magnetic Anisotropy in Two-dimensional van der Waals Magnetic Materials and Their Heterostructures: Importance, Mechanisms, and Opportunities
• Controlling magnetism through Ising superconductivity in magnetic van der Waals heterostructures
• Giant gate-tunable renormalization of spin-correlated flat-band states and bandgap in a 2D magnetic insulator
• Hamiltonian learning with real-space impurity tomography in topological moire superconductors
• Impurity-induced excitations in a topological two-dimensional ferromagnet/superconductor van der Waals moiré heterostructure
• Observation of Yu-Shiba-Rusinov-like states at the edge of CrBr3/NbSe2 heterostructure
• Tunable moire spinons in magnetically encapsulated twisted van der Waals quantum spin-liquids
• Helimagnetism in CrBr${}_2$ and CrIBr
• Moiré-enabled topological superconductivity
• Scanning tunneling microscopy study of helimagnetic monolayer CrBr2 on s-wave superconductor NbSe2: a topologically trivial system due to weak interfacial coupling
• Non-Topological Edge-Localized Yu-Shiba-Rusinov States in CrBr${}_3$/NbSe${}_2$ Heterostructures
• Designer quantum matter in van der Waals heterostructures