Also called CsV₃Sb₅, KV₃Sb₅, RbV₃Sb₅, kagome superconductors
The kagome lattice – triangles meeting corner to corner – is the textbook setting for frustration, flat bands and topological band crossings, and this family puts one in a metal that superconducts. Below roughly 80–100 K the electrons freeze into a charge order with a 2×2 pattern that appears to pick a handedness and, by some measurements, to break time-reversal symmetry without any magnetic moments. Superconductivity follows at a few kelvin, and the two orders push against each other, which is why so much of the field is spent arguing about which one is doing what.
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The kagome band structure supplies Dirac points, van Hove singularities and flat bands in one lattice, and in AV3Sb5 the van Hove points sit close enough to the Fermi level for nesting to matter. Candidate charge orders include a chiral, possibly loop-current state that breaks time-reversal symmetry without spins, which would be a lattice realisation of long-discussed Haldane- and Varma-type models. The superconducting state is the second puzzle: pairing on top of a reconstructed Fermi surface, with pair density wave modulations reported in tunnelling. Calculations must treat the 2×2×2 (and larger) reconstructed cells, and the small energy differences between competing charge patterns make the answer sensitive to the functional and to phonons.
Sample-to-sample variation is the field’s main confounder: alkali stoichiometry, residual flux and surface oxidation shift both transition temperatures. Report the charge-ordering and superconducting temperatures for each crystal, and the residual resistivity ratio. For time-reversal-symmetry claims, note that muon spin relaxation, Kerr and magneto-optical probes have not converged. In thin flakes, distinguish doping by oxidation from thickness effects by measuring both against a bulk reference.
Not an engineering material: transition temperatures of a few kelvin and air-sensitive surfaces rule out devices. Its interest is scientific – a clean, exfoliable setting where charge order, topology and superconductivity meet – and as a test bed for measuring competing orders in thin flakes.
The newest items tagged CsV3Sb5, KV3Sb5, from the news feed updated 5 Oct 2026.
Since the discovery of charge density wave (CDW) and superconductivity, kagome metal AV3Sb5 (A = K, Rb, Cs) provides a new platform for exploring novel many-body quantum phenomena. In CsV3Sb5, a stripe-like CDW with commensurate wave vector q = 3/8 was observed under moderate pressures, which leads to a peculiar…
The kagome material has rapidly established itself as a research frontier in condensed matter physics, owing to its distinctive geometric structure and the rich array of unconventional physical phenomena. In the kagome AV3Sb5 (A = K, Rb, Cs) family, the charge-ordered state exhibits a remarkable characteristic, i.e.…
Superconductors are many-body quantum states in which current flows without dissipation. Theory predicts that supercurrents follow a relatively simple spatial pattern in both conventional and unconventional superconductors. Recent studies into the AV3Sb5 (A = Cs, K, Rb) family of Kagome superconductors indicate that…
Superconductivity and its potential applications are governed by the symmetry of the superconducting order parameter. In the kagome metal CsV3Sb5, most bulk studies indicate conventional s-wave pairing. However, ultrathin flakes exhibit nonreciprocal transport, in particular a zero-field superconducting diode effect…
The kagome superconductor family AV3Sb5 (A=Cs, Rb, K) provides a rich platform for exploring diverse electronic symmetry breaking phenomena, including superconductivity and various forms of density wave orders. Although these compounds share the identical lattice structure in the normal state, they exhibit distinct…
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