High-Tc superconductors with CuO2 layers, manganites La1−xSrxMnO3, and cobaltites LaCoO3 present several mysteries in their physical properties. Most of them are believed to come from the strongly-correlated nature of these materials. From the theoretical viewpoint, there are many hidden rocks in making the consistent description of the band structure and low-energy physics starting from the Fermi-liquid approach. Here we discuss the alternative method -- multielectron approach to the electronic structure calculations for the Mott insulators -- called LDA+GTB (local density approximation + generalized tight-binding) method. Its origin is a straightforward generalization of the Hubbard perturbation theory in the atomic limit and the multiband p−d Hamiltonian with the parameters calculated within LDA. We briefly discuss the method and focus on its applications to cuprates, manganites, and cobaltites.
@article{arxiv.1208.4500,
title = {Cuprates, Manganites, and Cobaltites: Multielectron Approach to the Band Structure},
author = {M. M. Korshunov and S. G. Ovchinnikov and E. I. Shneyder and V. A. Gavrichkov and Yu. S. Orlov and I. A. Nekrasov and Z. V. Pchelkina},
journal= {arXiv preprint arXiv:1208.4500},
year = {2015}
}