X-ray imaging of dispersive charge modes in a doped Mott insulator near the antiferromagnet/superconductor transition

Y. W. Li, D. Qian, L. Wray, D. Hsieh, Y. Xia, Y. Kaga, T. Sasagawa, H. Takagi, R. S. Markiewicz, A. Bansil, H. Eisaki, S. Uchida, M. Z. Hasan

    Research output: Contribution to journalArticle

    Abstract

    Momentum-resolved inelastic resonant x-ray scattering is used to map the doping evolution of bulk electronic modes in the doped Mott insulator class Nd2-x Cex CuO4. As the doping induced antiferromagnet/superconductor (AFM/SC) transition is approached, we observe an anisotropic redistribution of the spectral weight of collective excitations over a large energy scale along the Γ→ (π,π) direction, whereas the modes exhibit broadening (∼1eV) with relatively little softening along Γ→ (π,0) with respect to the parent Mott state (x=0). Our study reveals a closing of the charge gap in the vicinity of the zone center even though the mode softening and spectral redistribution involve an unusually large energy scale over the full Brillouin zone. The collective behavior of modes in the vicinity of the AFM/SC critical transition is demonstrated.

    Original languageEnglish (US)
    Article number073104
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume78
    Issue number7
    DOIs
    StatePublished - Aug 15 2008

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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  • Cite this

    Li, Y. W., Qian, D., Wray, L., Hsieh, D., Xia, Y., Kaga, Y., Sasagawa, T., Takagi, H., Markiewicz, R. S., Bansil, A., Eisaki, H., Uchida, S., & Hasan, M. Z. (2008). X-ray imaging of dispersive charge modes in a doped Mott insulator near the antiferromagnet/superconductor transition. Physical Review B - Condensed Matter and Materials Physics, 78(7), [073104]. https://doi.org/10.1103/PhysRevB.78.073104