Evaluating covalency using RIXS spectral weights: Silver fluorides vs. cuprates
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arXiv
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908704918470656 |
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| author | Degtev, Ilya Jezierski, Daniel Pueyo, Adrián Gómez Di Gaspare, Luciana De Seta, Monica Barone, Paolo Ghiringhelli, Giacomo Glatzel, Pieter Mazej, Zoran Grochala, Wojciech Sala, Marco Moretti Lorenzana, José |
| author_facet | Degtev, Ilya Jezierski, Daniel Pueyo, Adrián Gómez Di Gaspare, Luciana De Seta, Monica Barone, Paolo Ghiringhelli, Giacomo Glatzel, Pieter Mazej, Zoran Grochala, Wojciech Sala, Marco Moretti Lorenzana, José |
| contents | We investigate the electronic structure of AgF2, AgFBF4, AgF and Ag2O using X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS) at the Ag L3 edge. XAS results were compared with density functional theory computations of the spectra, allowing an identification of main features and an assessment of the theoretical approximations. Our RIXS measurements reveal that AgF2 exhibits charge transfer excitations and dd excitations, analogous to those observed in La2CuO4. We propose to use the ratio of dd to CT spectral weight as a measure of the covalence of the compounds and provide explicit equations for the weights as a function of the scattering geometry for crystals and powders. The measurements at the metal site L3 edge and previous measurements at the ligand K edge reveal a striking similarity between the fluorides and cuprates materials, with fluorides somewhat more covalent than cuprates. These findings support the hypothesis that silver fluorides are an excellent platform to mimic the physics of cuprates, providing a promising avenue for exploring high-Tc superconductivity and exotic magnetism in quasi-two-dimensional (AgF2) and quasi-one-dimensional (AgFBF4) materials. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_10219 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Evaluating covalency using RIXS spectral weights: Silver fluorides vs. cuprates Degtev, Ilya Jezierski, Daniel Pueyo, Adrián Gómez Di Gaspare, Luciana De Seta, Monica Barone, Paolo Ghiringhelli, Giacomo Glatzel, Pieter Mazej, Zoran Grochala, Wojciech Sala, Marco Moretti Lorenzana, José Strongly Correlated Electrons Superconductivity We investigate the electronic structure of AgF2, AgFBF4, AgF and Ag2O using X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS) at the Ag L3 edge. XAS results were compared with density functional theory computations of the spectra, allowing an identification of main features and an assessment of the theoretical approximations. Our RIXS measurements reveal that AgF2 exhibits charge transfer excitations and dd excitations, analogous to those observed in La2CuO4. We propose to use the ratio of dd to CT spectral weight as a measure of the covalence of the compounds and provide explicit equations for the weights as a function of the scattering geometry for crystals and powders. The measurements at the metal site L3 edge and previous measurements at the ligand K edge reveal a striking similarity between the fluorides and cuprates materials, with fluorides somewhat more covalent than cuprates. These findings support the hypothesis that silver fluorides are an excellent platform to mimic the physics of cuprates, providing a promising avenue for exploring high-Tc superconductivity and exotic magnetism in quasi-two-dimensional (AgF2) and quasi-one-dimensional (AgFBF4) materials. |
| title | Evaluating covalency using RIXS spectral weights: Silver fluorides vs. cuprates |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2512.10219 |