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Destructive interference of electron hopping on the frustrated kagome latticegenerates Dirac nodes, saddle points, and flat bands in the electronicstructure. The latter provides the narrow bands and a peak in the density ofstates that can generate correlated electron behavior when the Fermi level lieswithin them. In the kagome metal CoSn, this alignment is not realized, and thecompound is a Pauli paramagnet. Here we show that replacing part of the tinwith indium (CoSn1-xInx) moves the Fermi energy into the flat band region, withsupport from band structure calculations, heat capacity measurements, and angleresolved photoemission spectroscopy. The associated instability results in theemergence of itinerant antiferromagnetism with a Neel temperature up to 30K.Long range magnetic order is confirmed by neutron diffraction measurements,which indicate an ordered magnetic moment of 0.1-0.2 Bohr magnetons per Co (forx = 0.4). Thus, CoSn1-xInx provides a rare example of an itinerantantiferromagnet with a small ordered moment. This work provides clear evidencethat flat bands arising from frustrated lattices in bulk crystals represent aviable route to new physics, evidenced here by the emergence of magnetic orderupon introducing a non-magnetic dopant into a non-magnetic kagome metal.

Flat-Band Itinerant Antiferromagnetism in the Kagome Metal CoSn1-xInx