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 journalArticlepeer-review

    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 2008

    Keywords

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

    ASJC Scopus subject areas

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

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