Raman scattering and the role of magnetic frustration in competing iron chalcogenide spin orders

ORAL

Abstract

Understanding the competition between different magnetic orders in the iron chalcogenides is crucial to unraveling the nature of leading instabilities in Fe-based superconductors. Previous studies have suggested that the magnetic properties can be well captured by an extended $S=1$ Heisenberg model. Using exact diagonalization, we map a phase diagram reflecting dominant magnetic orders and correlate this information with the temperature dependence of calculated Raman and spin response functions in the vicinity of phase boundaries. This behavior is reminiscent of recent experimental measurents on these materials and provides new perspectives on the role of frustration in iron chalcogenides.

*Stanford Institute for Materials and Energy Sciences, NERSC

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Authors

  • Harrison Ruiz

    • Stanford University Department of Physics

  • Yao Wang

    • Department of Applied Physics, Stanford University; SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences
    • Stanford University
    • Stanford University Department of Applied Physics

  • Brian Moritz

    • SLAC National Accelerator Laboratory
    • SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences
    • Stanford Institute for Material and Energy Sciences

  • Thomas Devereaux

    • Stanford Unviersity
    • Stanford Institute for Materials and Energy Sciences, Stanford University & SLAC
    • SLAC National Accelerator Laboratory
    • SLAC National Accelerator Laboratory, Stanford Institute for Materials and Energy Sciences
    • Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA, USA
    • Stanford Univ
    • SLAC National Accelerator Laboratory/Stanford University
    • Stanford Institute for Material and Energy Sciences