Evolution of low-lying states in a doped CDW superconductor CuxTiSe2

D. Qian, D. Hsieh, L. Wray, Y. Xia, R. J. Cava, E. Morosan, M. Z. Hasan

    Research output: Contribution to journalArticle

    Abstract

    A superconducting state has recently been observed by only a slight copper doping (∼4%) of the metallic 2D commensurate charge-density-wave (CDW) phase of titanium diselenide. We have employed high-resolution photoemission spectroscopy (ARPES) to probe the evolution of low-lying states, providing evidence that the CDW in the doped system is not due to Fermi surface nesting. With increasing copper concentration, we observe a significant rise of the chemical potential and a manifold of low-lying states at the top of the Fermi sea with increasing particle-hole asymmetry. These effects taken together contribute to destabilize the observed commensurate electronic, possibly, excitonic order in the vicinity of the superconducting doping in this system.

    Original languageEnglish (US)
    Pages (from-to)1002-1004
    Number of pages3
    JournalPhysica B: Condensed Matter
    Volume403
    Issue number5-9
    DOIs
    StatePublished - Apr 1 2008

    Keywords

    • CDW
    • Superconductor

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Electrical and Electronic Engineering

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