Electronic Screening-Enhanced Hole Pairing in Two-Leg Spin Ladders Studied by High-Resolution Resonant Inelastic X-Ray Scattering at Cu $\mathrm{M}$ Edges
- Rusydi, A.
- Goos, A.
- Uchida, S.
- Guerassimova, N.
- Treusch, R.
- Feldhaus, J.
- Reininger, R.
- Klein, M. V.
- Rübhausen, M.
- Binder, S.
- Eich, A.
- Botril, K.
- Abbamonte, P.
- Yu, X.
- Breese, M. B. H.
- Eisaki, H.
- Fujimaki, Y.
Publication date
January 2014
DOI Publisher
American Physical Society (APS)Abstract
We study the electronic screening mechanisms of the effective Coulomb on-site repulsion in hole-doped Sr14Cu24O41 compared to undoped La6Ca8Cu24O41 using polarization dependent high-resolution resonant inelastic x-ray scattering at Cu M edges. By measuring the energy of the effective Coulomb on-site repulsion and the spin excitations, we estimate superexchange and hopping matrix element energies along rungs and legs, respectively. Interestingly, hole doping locally screens the Coulomb on-site repulsion reducing it by as much as 25%. We suggest that the increased ratio of the electronic kinetic to the electronic correlation energy contributes to the local superexchange mediated pairing between holes
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