Intertwined Order Parameters in a Charge-Ordered Superconductor

ORAL

Abstract

We present a spectroscopic study of the low temperature state in NbSe$_2$, exhibiting charge-density wave and superconductivity orders. Raman scattering reveals that the spectrum of quasi-particle excitations out of the condensate is characterized by an energy gap derived from both order parameters in a way that suggests intertwining between them. Supported by a calculation of NbSe$_2$ Raman vertices, and by earlier photoemission studies, we conclude that in NbSe$_2$ an isotropic superconductivity interplays with a strongly anisotropic charge-density wave order on selected parts of the Fermi surface, as characterized by admixture of particle-particle and particle-hole excitations.

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Authors

  • Aleksej Mialitsin

    NREL

  • Ilia Solv'yov

    University of the Southern Denmark

  • Anna Toth

    Vienna University of Technology

  • Igor Mazin

    Naval Research Lab, Naval Research Laboratory Washington, Naval Research Laboratory

  • Andriy Nevidomskyy

    Rice University, Department of Physics and Astronomy, 6100 Main St., Houston, TX 77005, Department of Physics, Rice University, Rice University, Department of Physics and Astronomy, Rice University

  • Brian Dennis

    Rutgers University

  • Girsh Blumberg

    Rutgers, the State University of New Jersey, Rutgers, The State University of New Jersey, Rutgers University