ARPES studies of the iron pnictide superconductors

ORAL

Abstract

A lot of progress has been made in understanding the family of iron-based pnictide superconductors since its discovery. However, many issues still remain. Here we use angle-resolved photoemission to study the electronic structures of various pnictide materials. Specifically, through a systematic high-resolution study of the parent compounds (Ba,Sr)Fe$_{2}$As$_{2}$, we show that the electronic structures of these materials are significantly reconstructed across the spin density wave transition, which cannot be described by a simple folding scenario of conventional density wave ordering. Moreover, we find that LDA calculations with an incorporated suppressed magnetic moment of 0.5$\mu _{B}$ can match well the details in the reconstructed electronic structure, suggesting that the nature of magnetism in the pnictides is more itinerant than local, while the origin of suppressed magnetic moment remains an important issue for future investigations.

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Authors

  • Ming Yi

    • Stanford University

  • Donghui Lu

    • Stanford University
    • Stanford Synchrotron Radiation Lightsource

  • James Analytis

    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA.
    • GLAM, Stanford University, Ca 94304
    • Stanford University

  • Jiun-Haw Chu

    • Stanford University

  • Sung-Kwan Mo

    • Advanced Light Source

  • Ruihua He

    • Stanford University
    • Stanford \& SIMES

  • Makoto Hashimoto

    • Advanced Light Source

  • Rob Moore

    • Stanford Synchrotron Radiation Lightsource, SLAC
    • Stanford Synchrotron Radiation Lightsource

  • Igor Mazin

    • Naval Research Laboratory
    • Navel Research Laboratory

  • David J. Singh

    • Oak Ridge National Laboratory, Oak Ridge, TN 37831
    • Oak Ridge National Laboratory
    • ORNL
    • Materials Science and Technology Division, Oak Ridge National Laboratory

  • Ian Fisher

    • Stanford
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA.
    • GLAM, Stanford University, Ca 94304
    • Stanford University

  • Zhi-Xun Shen

    • Stanford University
    • Department of Physics and SIMES, Stanford University
    • Dept. Applied Physics, Stanford Univ
    • Geballe Laboratory for Advanced Materials, Stanford University