Tight-binding electronic structure of high Tc superconductors

Jean-Pierre Julien , D. Mayou , F. Cyrot-Lackmann

New superconducting oxides have important crystallographic similarities. They are bulk perovskites or structure derived compounds such as the K 2NiF4 one, with an alternating nature : the oxygen atoms nearest-neighbours are metallic atoms and vice-versa. We show that this structural property has important consequences on the electronic structure. We first present a general formalism allowing us to describe in a simple way the electronic structure as soon as one has an alternating lattice. In a second part, we illustrate this method for different oxides related with the high T c superconductors. Lastly, we show the results we obtain with the alternating lattice method in the two-band model of the CuO2 plane which is characteristic of the copper-based new superconductors.

Keywords: band structure of crystalline semiconductors and insulators; high temperature superconductors; tight binding calculations

Domains: Physics archives

Jean-Pierre Julien, D. Mayou, F. Cyrot-Lackmann. Tight-binding electronic structure of high Tc superconductors. Journal de Physique, 1989, 50 (18), pp.2683-2693. ⟨10.1051/jphys:0198900500180268300⟩. ⟨jpa-00211093⟩