Phys.org March 13, 2023
Various correlated electronic phases have been discovered in kagome lattice materials, including magnetism, charge density waves, nematicity and superconductivity. Recently, a charge density wave was discovered in the magnetic kagome FeGe, providing a platform for understanding the interplay between charge order and magnetism in kagome materials. An internationl team of researchers (USA – Rice University, UC Berkeley, University of Washington, University, SLAC National Acclerator Laboratory, Oak Ridge National Laboratory, Lawrence Berkeley Laboratory, Israel, China) observed all three electronic signatures of the kagome lattice in FeGe using angle-resolved photoemission spectroscopy. They showed that the presence of van Hove singularities near the Fermi level was driven by the underlying magnetic exchange splitting. They showed spectral evidence for the charge density wave as gaps near the Fermi level. According to the researchers their observations point to the magnetic interaction-driven band modification resulting in the formation of the charge density wave and indicate an intertwined connection between the emergent magnetism and charge order in this moderately correlated kagome metal… read more. TECHNICAL ARTICLEÂ
Crystal structure and electronic structure. Credit: Nature Physics (2023)