Frustrated spin order in FeSe

ORAL

Abstract

Magnetism in the structurally simplest iron based superconductor, FeSe, poses a challenge. Unlike in the related iron pnictide compounds, no magnetic order was found down to lowest temperatures in FeSe. However, recent theoretical and experimental studies point towards frustration quenching long range order. Here we demonstrate that inelastic light scattering can distinguish between itinerant and localized magnetism. We find the Raman response from FeSe to be more similar to localized systems such as cuprates. Together with simulations of a spin-1 Heisenberg model this furnishes evidence that FeSe hosts an almost fully frustrated system of essentially localized moments.

*Work in Europe was supported by the DFG via SPP 1458 and TRR80, by the Serbian Ministry of Education, Science and Technological Development (Project III45018), by the DAAD, and by BaCaTeC. Work in the SIMES at Stanford University and SLAC was supported by the U.S. DOE, Office of Basic Energy Sciences (DE-AC02-76SF00515) and Office of Science (DE-AC02-05CH11231).

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Presenters

  • Andreas Baum

    • Walther Meissner Institute, Bavarian Academy of Sciences and Humanities

Authors

  • Andreas Baum

    • Walther Meissner Institute, Bavarian Academy of Sciences and Humanities

  • Harrison N Ruiz

    • Stanford University

  • Nenad Lazarević

    • Institute of Physics Belgrade

  • Yao Wang

    • Harvard University
    • Department of Physics, Harvard University

  • Thomas U Boehm

    • Walther Meissner Institute, Bavarian Academy of Sciences and Humanities

  • Ramez Hosseinian Ahangharnejhad

    • Walther Meissner Institute, Bavarian Academy of Sciences and Humanities

  • Thomas Wolf

    • Karlsruhe Institute of Technology

  • Brian Moritz

    • SLAC National Accelerator Laboratory and Stanford University, SSRL Materials Science Division
    • SLAC National Accelerator Laboratory
    • SLAC
    • Stanford University
    • SIMES, SLAC
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA

  • Thomas Devereaux

    • Stanford Univ
    • Materials Science and Engineering, Stanford University
    • Stanford University
    • SLAC National Accelerator Laboratory
    • Photon Sciences, Stanford Linear Accelerator (SLAC)
    • SIMES, SLAC
    • Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
    • SLAC National Accelerator Lab.

  • Rudolf Hackl

    • Walther Meissner Institute, Bavarian Academy of Sciences and Humanities