Condens. Matter, Volume 5, Issue 4 (December 2020) – 27 articles
Cover Story (view full-size image): Chemical bonding is well adapted to discuss electronic instabilities and their impact on local aspects of superconductivity mechanisms: Mulliken electronegativity, Pearson hardness for atomic polarizability, van der Waals forces for charge-induced dipole interactions. Anionic or cationic clusters may undergo a partial disproportionation, an important phenomenon in chemistry; physicists would refer to this as a « negative-U » system. Is this static description also valid at the pico- and femto-second timescales of phonons and electronic dipole oscillations, respectively? The non-crossing rule imposes the mixing of electron states at the Fermi level, from which partial charge disproportionation occurs. Thus, as shown in this work, two approaches from chemistry lead to coupled charge fluctuations in titanate, cuprate, and iron selenide superconducting systems. View this paper
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