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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.

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 B1g 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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Verlagsausgabe §
DOI: 10.5445/IR/1000091360
Veröffentlicht am 20.02.2019
DOI: 10.1038/s42005-019-0107-y
Zugehörige Institution(en) am KIT Institut für Festkörperphysik (IFP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 2399-3650
KITopen-ID: 1000091360
HGF-Programm 43.21.01 (POF III, LK 01)
Erschienen in Communications Physics
Band 2
Heft 1
Seiten Article No.14
Vorab online veröffentlicht am 04.02.2019
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