A silver(II) route to unconventional superconductivity
arXiv:2108.12167 · doi:10.1103/PhysRevB.105.134519
Abstract
The highly unusual divalent silver in silver difluoride (AgF) features a nearly square lattice of Ag 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 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 -wave superconducting pairing for bulk AgF 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 in the category of unconventional high- superconductors, and its chemical uniqueness may help shed new lights on the high- phenomena.
arXiv comment5 pages, 4 figures
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