Electronic screening-enhanced hole pairing in two-leg spin ladders studied by high-resolution resonant inelastic X-ray scattering at Cu M edges

A. Rusydi, A. Goos, S. Binder, A. Eich, K. Botril, P. Abbamonte, X. Yu, M. B.H. Breese, H. Eisaki, Y. Fujimaki, S. Uchida, N. Guerassimova, R. Treusch, J. Feldhaus, R. Reininger, M. V. Klein, M. Rübhausen

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish (US)
Article number067001
JournalPhysical review letters
Volume113
Issue number6
DOIs
StatePublished - Aug 4 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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