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