Frustrated spin order and stripe fluctuations in FeSe

Baum, A.; Ruiz, H. N.; Lazarević, N.; Wang, Yao; Böhm, T.; Hosseinian Ahangharnejhad, R.; Adelmann, P.; Wolf, T.; Popović, Z. V.; Moritz, B.; Devereaux, T. P.; Hackl, R.

doi:10.1038/s42005-019-0107-y

Frustrated spin order and stripe fluctuations in FeSe

Journal Article · Mon Feb 04 04:00:00 EST 2019 · Communications Physics

DOI:https://doi.org/10.1038/s42005-019-0107-y· OSTI ID:1619707

; Ruiz, H. N.; Lazarević, N.; ; Böhm, T.; Hosseinian Ahangharnejhad, R.; Adelmann, P.; Wolf, T.; Popović, Z. V.; Moritz, B.; Devereaux, T. P.;

Abstract

The charge and spin dynamics of the structurally simplest iron-based superconductor, FeSe, may hold the key to understanding the physics of high temperature superconductors in general. Unlike the iron pnictides, FeSe lacks long range magnetic order in spite of a similar structural transition around 90 K. Here, we report results of Raman scattering experiments as a function of temperature and polarization and simulations based on exact diagonalization of a frustrated spin model. Both experiment and theory find a persistent low energy peak close to 500 cm ⁻¹ in B _{1 g} symmetry, which softens slightly around 100 K, that we assign to spin excitations. By comparing with results from neutron scattering, this study provides evidence for nearly frustrated stripe order in FeSe.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515; AC02-05CH11231

OSTI ID:: 1619707

Journal Information:: Communications Physics, Journal Name: Communications Physics Journal Issue: 1 Vol. 2; ISSN 2399-3650

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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