Experimental determination of superexchange energy from two-hole spectra

2021/07/19 by Levy, Giorgio, Yaari, Maayan, Regier, Tom Z. +1
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)

paper · doi:10.48550/arxiv.2107.09181

Abstract

We follow the evolution of Copper and Oxygen two-hole excitations, in optimally doped (Ca_xLa_1-x)(Ba_1.75-xLa_0.25+x )Cu₃O_y for x=0.1 and x=0.4. The spectra have contributions from band states as well as a localized multiplet structure. From their identification, we determine the intrashell Coulomb interaction U for Oxygen and Copper sites. These results allow us to estimate the atomic superexchange coupling J suggesting a positive correlation between the maximal superconducting critical temperature T_C^max and J.

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