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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.

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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