Metal-insulator transition in a CuO chain created by Kondo interaction
Todor M. Mishonov, Albert M. Varonov, Kaloian D. Lozanov
公開日: 2025/9/27
Abstract
Over twenty years ago Alexei Abrikosov [A.A. Abrikosov, Metal-insulator transition in layered cuprates (SDW model), Physica C: Supercond. Vol. 391, 2, 147-159 (2003)] considered the Spin-Density-Waves (SDW) model for the metal-insulator transition in layered cuprates. In one of those cuprates, YBa$_2$Cu$_3$O$_{7-\delta}$, there are one-dimensional (1D) CuO chains of copper and oxygen ions. In the present work we consider the metal-insulator transition in the model case of a 1D CuO chain in the regime of half-filling of the band. Our model is essentially the same, but as an exchange interaction causing the metal-insulator transition, we consider Kondo-Zener two-electron exchange, which successfully describes many of the electronic properties of the layered cuprates.