The silver route to cuprate analogs

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.

15 pages, 3 figures plus Supplementary Information in ancillary folder

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• Infinite-layer fluoro-nickelates as $d^9$ model materials
• Charge Transfer and $dd$ excitations in AgF${}_2$
• Fluorides of silver under large compression
• Computational study of antiferromagnetic and mixed-valent diamagnetic phase of AgF2: crystal, electronic and phonon structure and p-T phase diagram
• Theoretical study of ternary silver fluorides AgMF4 (M = Co, Ni, Cu) formation at pressures up to 20 GPa
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• Fate of doped carriers in silver fluoride cuprate analogues
• Novel Copper Fluoride Analogs of Cuprates
• Defect trapping and phase separation in chemically doped bulk AgF2
• Low temperature magnetism of KAgF3
• Strength of Correlations in a Silver Based Cuprate Analogue
• SrRuO${}_3$-SrTiO${}_3$ heterostructure as a possible platform for studying unconventional superconductivity in Sr${}_2$RuO${}_4$
• Lattice dynamics of KAgF3 perovskite, unique 1D antiferromagnet
• Charge doping to flat AgF2 monolayers in a chemical capacitor setup
• Charge ordering mechanism in silver fluoride AgF${}_2$
• Gigantic work function in layered AgF2
• Polymorphism of two-dimensional antiferromagnets, AgF2 and CuF2
• A silver(II) route to unconventional superconductivity
• Phase transitions and amorphization of M2AgF4 (M = Na, K, Rb) compounds at high pressure
• Unexpected coexisting solid solutions in the quasi-binary Ag(II)F2/Cu(II)F2 phase diagram
• Crystal structure, lattice dynamics and superexchange in MAgF3 1D antiferromagnets (M = K, Rb, Cs) and Rb3Ag2F7 Ruddlesden-Popper phase
• Superexchange interactions in AgMF4 (M = Co, Ni, Cu) polymorphs
• Stability of hypothetical AgIICl2 polymorphs under high pressure, revisited : a computational study
• A unique two-dimensional silver(II) antiferromagnet Cu[Ag(SO4)2] and perspectives for its further modifications
• How orbitals and oxidation states determine apparent topographies in scanning tunneling microscopy: the case of fluorine on silver surfaces
• 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)
• The fate of compound with AgF${}_2$ plus AgO stoichiometry. A theoretical study
• Ag(II) as spin super-polarizer in metal fluoride clusters
• Structural phase transitions and magnetic superexchange in MIAgIIF3 perovskites at high pressure
• The initial stages of silver fluorination: a scanning tunneling microscopy investigation
• Observation of a new polyhalide phase in Ag-Cl${}_2$ system at high pressure
• 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