Fate of doped carriers in silver fluoride cuprate analogues

Abstract

AgF${}_2$ is a correlated charge-transfer insulator with properties remarkably similar to insulating cuprates which have raised hope that it may lead to a new family of unconventional superconductors upon doping. We use ab initio computations to study doping strategies leading to metallization. Because the upper Hubbard band is very narrow electron doping leads to undesired strongly self-trapped states (polarons). For the hole-doped case, polaron tendency is stronger than for cuprates but still moderate enough to expect that heavily doped compounds may become metallic. Since the strong electron lattice coupling originates in the strong buckling we study also an hypothetically flat allotrope and show that it has excellent prospect to become metallic. We compare the AgF2 behavior with that for the hole-doped conventional cuprate La${}_2$CuO${}_4$ and electron-doped Nd${}_2$CuO${}_4$. Our results show a clear path to achieve high temperature superconductivity in silver fluorides.

arXiv comment5 pages, 4 figures

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• Charge doping to flat AgF2 monolayers in a chemical capacitor setup
• Polymorphism of two-dimensional antiferromagnets, AgF2 and CuF2
• A silver(II) route to unconventional superconductivity
• Novel Ternary AgIICoIIIF5 Fluoride: Synthesis, Structure and Magnetic Characteristics
• Controlling Orbital Ordering of Intergrowth Structures with Flat [Ag(II)F2] Layers to Mimic Oxocuprates(II)
• Magnetic interactions as a pivotal determinant in stabilizing a novel AgIIAgIIIF5 polymorph with high spin AgIII
• Evaluating covalency using RIXS spectral weights: Silver fluorides vs. cuprates