A silver(II) route to unconventional superconductivity

Abstract

The highly unusual divalent silver in silver difluoride (AgF${}_2$) features a nearly square lattice of Ag${}^{+2}$ bridged by fluorides. As a structural and electronic analogue of cuprates, its superconducting properties are yet to be examined. Our first principles electronic structure calculations reveal a striking resemblance between AgF${}_2$ and the cuprates. Computed spin susceptibility shows a magnetic instability consistent with the experimentally observed antiferromagnetic transition. A linearized Eliashberg theory in fluctuation-exchange approximation shows an unconventional singlet $d$-wave superconducting pairing for bulk AgF${}_2$ at an optimal electron doping. The pairing is found to strengthen with a decreasing interlayer coupling, highlighting the importance of quasi-2D nature of the crystal structure. These findings place AgF${}_2$ in the category of unconventional high-$T_{\text{C}}$ superconductors, and its chemical uniqueness may help shed new lights on the high-$T_{\text{C}}$ phenomena.

5 pages, 4 figures

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Cited by in corpus (2)

• Charge doping to flat AgF2 monolayers in a chemical capacitor setup
• Controlling Orbital Ordering of Intergrowth Structures with Flat [Ag(II)F2] Layers to Mimic Oxocuprates(II)