Fluorine adatoms on silver appear as depressions or sombreros in STM because oxidation contracts the silver 5s orbitals while fluorine 2p orbitals protrude at negative bias.
The silver route to cuprate analogs
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abstract
The parent compound of high-Tc superconducting cuprates is a unique Mott state consisting of layers of spin-1/2 ions arranged on a square lattice and with a record high antiferromagnetic coupling within the layers. Compounds with similar characteristics have long been searched for. Nickelates and iridates had been proposed as cuprate analogs but so far have not reached a satisfactory similarity. Here we use a combination of experimental and theoretical tools to show that the commercial compound AgF2 is an excellent cuprate analog with remarkably similar electronic parameters to La2CuO4 but larger buckling of planes. Two-magnon Raman scattering reveals a superexchange constant which reaches 70% of that of a typical cuprate. We argue that structures that reduce or eliminate the buckling of the AgF2 planes could have an antiferromagnetic coupling that matches or surpasses the cuprates.
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cond-mat.mtrl-sci 1years
2024 1verdicts
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How orbitals and oxidation states determine apparent topographies in scanning tunneling microscopy: the case of fluorine on silver surfaces
Fluorine adatoms on silver appear as depressions or sombreros in STM because oxidation contracts the silver 5s orbitals while fluorine 2p orbitals protrude at negative bias.