Fermi surface topology and low-lying electronic structure of a new iron-based superconductor Ca$_{10}$(Pt$_{3}$As$_{8})$(Fe$_{2}$As$_{2})_{5}$

ORAL

Abstract

We report a first study of low energy electronic structure and Fermi surface topology for the recently discovered iron-based superconductor Ca$_{10}$(Pt$_{3}$As$_{8})$(Fe$_{2}$As$_{2})_{5}$ (the 10-3-8 phase, with Tc $\sim $ 8 K), via angle resolved photoemission spectroscopy (ARPES). Despite its triclinic crystal structure, ARPES results reveal a fourfold symmetric band structure with the absence of Dirac-cone-like Fermi dots (related to magnetism) found around the Brillouin zone corners in other iron-based superconductors. Considering that the triclinic lattice and structural supercell arise from the Pt$_{3}$As$_{8}$ intermediary layers, these results indicate that those layers couple only weakly to the FeAs layers in this new superconductor at least near the surface, which has implications for the determination of its potentially novel pairing mechanism.

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Authors

  • Chang Liu

    • Joseph Henry Laboratory and Dept. of Physics, Princeton University

  • Madhab Neupane

    • Department of Physics, Princeton University
    • Joseph Henry Laboratory and Dept. of Physics, Princeton University

  • Su-Yang Xu

    • Princeton University
    • Dept. of Physics, Princeton University, Princeton, NJ 08544
    • Joseph Henry Laboratory and Dept. of Physics, Princeton University

  • Y.J. Wang

    • Department of Physics, Northeastern University

  • Ni Ni

    • Chemistry department, Princeton University
    • Department of Chemistry, Princeton University

  • J.M. Allred

    • Chemistry department, Princeton University
    • Department of Chemistry, Princeton University

  • L.A. Wray

    • Lawrence Berkeley National Laboratory
    • Joseph Henry Laboratory and Dept.of Physics, Princeton University; Advanced Light Source, Lawrence Berkeley National Laboratory

  • Hsin Lin

    • Northeastern U.
    • Northeastern University
    • Department of Physics, Northeastern University

  • R.S. Markiewicz

    • Northeastern University
    • Department of Physics, Northeastern University

  • Arun Bansil

    • Northeastern University
    • Northeastern U.
    • Department of Physics, Northeastern University

  • Robert Cava

    • Chemistry department, Princeton University
    • Department of Chemistry, Princeton University, Princeton, New Jersey 08544, USA
    • Princeton University
    • Department of Chemistry, Princeton University

  • M. Zahid Hasan

    • Princeton University
    • Dept. of Physics, Princeton University, Princeton, NJ 08544
    • Princeton University Physics
    • Joseph Henry Laboratory and Dept. of Physics, Princeton University