Epitaxial engineering of flat silver fluoride cuprate analogs
Adam Grzelak, Haibin Su, Xiaoping Yang, Dominik Kurzydłowski, José Lorenzana, Wojciech Grochala
Abstract
Silver(II) fluoride AgF${}_{2}$ 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 AgF${}_{2}$ 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 AgF${}_{2}$ layer can reach 195 K.