Silver(II) route to unconventional superconductivity

Xiaoqiang Liu; Shishir K. Pandey; Ji Feng

doi:10.1103/PhysRevB.105.134519

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Silver(II) route to unconventional superconductivity

Xiaoqiang Liu, Shishir K. Pandey, Ji Feng

DOI 10.1103/PhysRevB.105.134519 · Physical Review B

T1

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Abstract

The highly unusual divalent silver in silver difluoride (AgF2) features a nearly square lattice of Ag+2 bridged by fluorides. As a structural and electronic analog of cuprates, its superconducting properties are yet to be examined. Our first-principles electronic structure calculations reveal a striking resemblance between AgF2 and the cuprates. Computed spin susceptibility shows a magnetic instability consistent with the experimentally observed antiferromagnetic transition. A linearized Eliashberg theory in the fluctuation-exchange approximation shows an unconventional singlet d-wave superconducting pairing for bulk AgF2 at an optimal electron doping. The pairing is found to strengthen with decreasing interlayer coupling, highlighting the importance of the quasi-two-dimensional nature of the crystal structure. These findings place AgF2 in the category of unconventional high-TC superconductors, and its chemical uniqueness may help shed light on the high-TC phenomena.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
AgF2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown