Based on the Wilson's criterion metal-insulator, extended to materials with strong electronic correlations, we have identified a specific class of the materials, which is not associated with their usual classification into Mott-Hubbard and charge transfer dielectrics. The local symmetry of these materials leads to a disappearance of quasiparticle states (so-called first removal or fist extra states) in the Hubbard's gap. It's especially unusual for the doped materials, where quasiparticles - charge carriers can disappear or appear under external factors, but the Mott transition has not yet been achieved. In the work we introduced the so-called a "quasiparticle transparency", and also provided specific experiments to identify the materials with the low quasiparticle transparency. Some examples of these materials with a spin crossover under high pressure and showing Jahn-Teller nature have been observed.
@article{arxiv.2311.03931,
title = {Doped Mott-Hubbard materials with a low quasiparticle transparency},
author = {Vladimir A. Gavrichkov},
journal= {arXiv preprint arXiv:2311.03931},
year = {2023}
}