Anisotropic Energy-Gaps of Iron-based Superconductivity from Intra-band Quasiparticle Interference in LiFeAs, Part I

ORAL

Abstract

Cooper pairing in the iron-based high-T$_c$ superconductors is thought to occur due to the projection of the antiferromagnetic interactions between neighboring iron atoms onto the complex momentum-space electronic structure. It is thus pivotal to have an exact measurement of the electronic structure in these materials. In this talk, I will introduce intra-band Bogoliubov quasiparticle scattering interference (QPI) to iron-based superconductor studies. We report a precise determination of the low energy band structure of LiFeAs using QPI. We observe three hole-like bands, in qualitative agreement with dHvA and ARPES studies (``$\gamma$, $\alpha_2$ \& $\alpha_1$''). The quantitative determination of the bandstructure is the foundation that we later use to measure the superconducting gap structure with QPI.

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Authors

  • M.P. Allan

    • CMPMS Department, Brookhaven National Laboratory, Upton, NY 11973, USA
    • Brookhaven National Laboratory, University of St Andrews, Cornell University

  • A.W. Rost

    • Cornell University, University of St Andrews

  • A.P. Mackenzie

    • University of St Andrews

  • Yang Xie

    • Cornell University

  • J.C. Davis

    • Brookhaven National Laboratory, Cornell University, University of St Andrews, Kavli Institute at Cornell for Nanoscale Science

  • K. Kihou

    • Institute of Advanced Industrial Science and Technology, Tsukuba, Japan

  • C.-H. Lee

    • Institute of Advanced Industrial Science and Technology, Tsukuba, Japan

  • A. Iyo

    • Institute of Advanced Industrial Science and Technology, Tsukuba, Japan

  • H. Eisaki

    • Institute of Advanced Industrial Science and Technology, Tsukuba, Japan

  • T.-M. Chuang

    • Academica Sinica, Taipei, Taiwan