Electronic Correlations and Satellites in Superconducting Oxides

Published

January 1, 1988

Author(s)

K Chang, Marvin Cohen, David R. Penn

Abstract

The satellite observed at binding energy of 12-13 eV below the Fermi level in the high-T_c oxide superconductors La_2-xSr_xCuO₄ and YBa₂Cu₃O_7-δ is viewed as originating from a state with two holes bound at the same Cu site. As in the case of Ni metal, the satellite is caused by an intra-d-shell shakeup process into a Cu 3d⁸ final state and its intensity is enhanced at resonance because of a super-Koster-Kronig transition. Based on the t-matrix approach for the hole self-energy, we study the effect of electronic correlations on the one-electron band structure. We examine the position of the satellite and find a large Coulomb interaction energy of 5 eV at the Cu site when the experimental satellite position is duplicated by the theory. Since this energy is comparable with the 3d bandwidth, the two-hole bound state is a high-energy excitation. This indicates that in the ground state a creation of two holes at the Cu site is unlikely and thus holes are formed at the O sites when Sr is substituted for La in La₂CuO₄ and when the oxidation is increased in YBa₂Cu₃O_7-δ.

Citation

Physical Review B (Condensed Matter and Materials Physics)

Volume

38

Issue

13

Pub Type

Journals

Citation

Chang, K. , Cohen, M. and Penn, D. (1988), Electronic Correlations and Satellites in Superconducting Oxides, Physical Review B (Condensed Matter and Materials Physics) (Accessed December 1, 2023)