Charge ordering mechanism in silver fluoride AgF$_2$

Autor: Derzsi, Mariana, Tokár, Kamil, Piekarz, Przemysław, Grochala, Wojciech
Rok vydání: 2021
Předmět:
Zdroj: Phys. Rev. B 105, L081113, 2022
Druh dokumentu: Working Paper
DOI: 10.1103/PhysRevB.105.L081113
Popis: Using Density Functional Theory, competition between Mott-Hubbard and intervalence charge transfer mechanism of electron localization is revealed in AgF$_2$, an important silver analogue of oxocuprates. We show that at reduced temperature and electron correlations AgF$_2$ becomes metallic and dynamically unstable in respect to CDW phonon modes that promote charge ordering. The CDW instability is closely related to Kohn anomaly and Fermi surface nesting. The long advocated KBrF$_4$ type CDW Ag$^{1+/3+}$F$_2$ structure and its facile transformation to the ground state Ag$^{2+}$F$_2$ phase is explained. Our results point out to intimate interplay between lattice, charge and spin degrees of freedom in seemingly simplistic binary metal fluoride.
Comment: 6 pager, 4 figures
Databáze: arXiv