Frustrated spin order and stripe fluctuations in FeSe

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 500cm${}^{-1}$ in $B_{1g}$ 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.

arXiv comment12 pages, 12 figures

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Cited by in corpus (18)

• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Lifshitz transition and frustration of magnetic moments in infinite-layer NdNiO${}_2$ upon hole-doping
• Quantum computation of magnon spectra
• Orbital selectivity in electron correlations and superconducting pairing of iron-based superconductors
• Effect of epitaxial strain on the electronic structure and magnetic correlations in infinite-layer (Nd,Sr)NiO${}_2$
• Magnetoresistance scaling, disorder, `hot spots' and the origin of $T$-linear resistivity in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Lattice-Shifted Nematic Quantum Critical Point in FeSe${}_{1-x}$S${}_x$
• Raman response in the nematic phase of FeSe
• Frustrated Magnetism from Local Moments in FeSe
• Fluctuations and pairing in Fe-based superconductors: Light scattering experiments
• Frustrated magnetic interactions in FeSe
• Phonon anomalies associated with spin reorientation in the Kagome ferromagnet Fe3Sn2
• Quadrupolar charge dynamics in the nonmagnetic FeSe${}_{1-x}$S${}_x$ superconductors
• Theoretical insights into electronic nematic order, bond-charge orders, and plasmons in cuprate superconductors
• Nematic Bogoliubov Fermi surfaces from magnetic toroidal order in FeSe${}_{1-x}$S${}_x$
• Suppression of Superconductivity and Nematic Order in Fe${}_{1-y}$Se${}_{1-x}$S${}_x$ (0$\le$$x$$\le$1, $y$$\le$0.1) Crystals by Anion Height Disorder
• Evolution of lattice, spin, and charge properties across the phase diagram of FeSe${}_{1-x}$S${}_x$
• Phase diagram of the J1-J2 Heisenberg second-order topological quantum magnet