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Ortiz, AV3Sb5 kagome superconductors, Nature Reviews Materials, 2024","review_link":"https://doi.org/10.1038/s41578-024-00677-y","review_verified":"true","summary":"In AV3Sb5 compounds ($A = \\mathrm{K}, \\mathrm{Rb}, \\mathrm{Cs}$) vanadium atoms form a kagome net of corner-sharing triangles; electrons there form a charge-density wave (a periodic ripple in electron density) near 80 to 100 K and superconduct below about 3 K, and a chromium relative superconducts under pressure. Whether the vanadium charge order carries circulating currents is disputed.","title":"Charge order and superconductivity in kagome metals","topic_ref":null,"why":"The kagome lattice places flat bands and van Hove singularities near the Fermi level, a setting predicted to produce loop-current and chiral orders not seen in other 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