Magnetism in parent Fe-chalcogenides: quantum fluctuations select a plaquette order

Samuel Ducatman, Natalia B. Perkins, Andrey Chubukov

We analyze magnetic order in iron-chalcogenide Fe${}_{1+y}$Te -- the parent compound of high-temperature superconductor Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$. Neutron scattering experiments sho…