Experimental determination of superexchange energy from two-hole spectra

Giorgio Levy; Maayan Yaari; Tom Z. Regier; Amit Keren

Experimental determination of superexchange energy from two-hole spectra

Superconductivity 2021-07-21 v1 Strongly Correlated Electrons

Authors: Giorgio Levy , Maayan Yaari , Tom Z. Regier , Amit Keren

Abstract

We follow the evolution of Copper and Oxygen two-hole excitations, in optimally doped (Ca $_{x}$ La $_{1-x}$ )(Ba $_{1.75-x}$ La $_{0.25+x}$ )Cu $_{3}$ O $_{y}$ 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 $T_\text{C}^{max}$ and $J$ .

Keywords

superexchange energy two-hole spectra copper oxide coulomb interaction superconducting critical temperature density functional theory

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@article{arxiv.2107.09181,
  title  = {Experimental determination of superexchange energy from two-hole spectra},
  author = {Giorgio Levy and Maayan Yaari and Tom Z. Regier and Amit Keren},
  journal= {arXiv preprint arXiv:2107.09181},
  year   = {2021}
}

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6 pages, 3 figures, one supplementary material

Experimental determination of superexchange energy from two-hole spectra

Abstract

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