Resonant X-ray Raman spectra of Cu dd excitations in Sr2CUO2Cl2

P Kuiper*, JH Guo, C Sathe, LC Duda, J Nordgren, JJM Pothuizen, FMF de Groot, GA Sawatzky

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

We present resonant x-ray Raman scattering results on Sr2CuO2Cl2, a model compound for high-T-c superconductors. We demonstrate that the dd excitations can be observed and show that the polarization dependence can be used to identify the dd excitations. We find the transition from the d(x2-y2) ground state to the d(xy) excited state at 1.35 eV and to the degenerate d(xz) and d(yz) excited states at 1.7 eV. From analysis of the polarization dependence we conclude that the d(3z2-r2) orbital energy is at 1.5 eV and not in the midinfrared (0.5 eV) as recently suggested. We use recent theoretical arguments to show that the d(3z2-r2) excitation is accompanied by a local spin flip resulting in a shift upwards of 0.2 eV due to the exchange interaction with the neighboring spins.

Original languageEnglish
Pages (from-to)5204-5207
Number of pages4
JournalPhysical Review Letters
Volume80
Issue number23
Publication statusPublished - 8 Jun 1998
Externally publishedYes

Keywords

  • LAMELLAR COPPER OXIDES
  • FLUORESCENCE SPECTROSCOPY
  • OPTICAL-ABSORPTION
  • EMISSION SPECTRA
  • LA2CUO4

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