Intermediate dimensional character of charge transfer excitation modes in a two-leg cuprate ladder

L. Wray, D. Qian, D. Hsieh, Y. Xia, T. Gog, D. Casa, H. Eisaki, M. Z. Hasan

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

Collective charge modes in the cuprate ladder compound Sr14 Cu24 O41 are studied over the one-dimensional Brillouin zone using resonant inelastic X-ray scattering. Low energy (2-4 eV) spectral weight across the Mott gap is dominated by a broad, dispersive feature containing two distinct peaks that may be interpreted as independent modes. Details of low energy dispersion, intensity distribution across the Brillouin zone and peak composition fall between the characteristic spectra of quasi-1D (e.g. SrCuO2) and -2D cuprates (e.g. Nd2CuO4). We demonstrate that dispersion and splitting between the two observed modes can be understood in a variant of the strong coupling limit (Hubbard-U ≫ t) with a single band Hubbard model.

Original languageEnglish (US)
Pages (from-to)3146-3148
Number of pages3
JournalJournal of Physics and Chemistry of Solids
Volume69
Issue number12
DOIs
StatePublished - Dec 1 2008

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Keywords

  • A. Oxides
  • D. Electrical properties
  • D. Electronic structure

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