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Nematic correlation length iron-based superconductors probed by inelastic x-ray scattering

Merritt, A.M.; Weber, F.; Castellan, J.-P.; Wolf, T.; Ishikawa, D.; Said, A.H.; Alatas, A.; Fernandes, R.M.; Baron, A.Q.R.; Reznik, D.

Abstract:
Nematicity is ubiquitous in electronic phases of high-Tc superconductors, particularly in the Fe-based systems. We used inelastic x-ray scattering to extract the temperature-dependent nematic correlation length ξ from the anomalous softening of acoustic phonon modes in FeSe, underdoped Ba(Fe0.97Co0.03)2As2 and optimally doped Ba(Fe0.94Co0.06)2As2. In all cases, we find that ξ is well described by a power law (T−T0)−1/2 extending over a wide temperature range. We attributed this mean-field behavior and the extended fluctuation regime to a sizable nemato-elastic coupling, which may be detrimental to superconductivity.

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Zugehörige Institution(en) am KIT Institut für Festkörperphysik (IFP)
Publikationstyp Forschungsbericht/Preprint
Publikationsjahr 2020
Sprache Englisch
Identifikator KITopen-ID: 1000104844
Vorab online veröffentlicht am 06.01.2020
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