Epitaxial engineering of flat silver fluoride cuprate analogs

Silver(II) fluoride AgF₂ is a charge-transfer insulator with layered structure, similar in many ways to precursors of cuprate superconductors. However, its bulk structure consists of corrugated layers, which precludes the emergence of strong antiferromagnetic interactions. The authors predict that a flat AgF₂ monolayer can be stabilized by epitaxy on an appropriate substrate, which leads to unprecedented enhancement of magnetic interactions and could potentially lead to superconductivity upon charge doping. Assuming a magnetic mechanism and extrapolating from the data for cuprates, they show that the superconducting critical temperature of a single AgF₂ layer can reach 195 K.