Nematic Correlation Length in Iron-Based Superconductors Probed by Inelastic X-Ray Scattering

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

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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 ζ 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 ζ is well described by a power law (T-T0)-1/2 extending over a wide temperature range. Combined with the previously reported Curie-Weiss behavior of the nematic susceptibility, these results point to the mean-field character of the nematic transition, which we attribute to a sizable nematoelastic coupling that is likely detrimental to superconductivity.

Original languageEnglish (US)
Article number157001
JournalPhysical review letters
Volume124
Issue number15
DOIs
StatePublished - Apr 17 2020

Bibliographical note

Funding Information:
D.R. would like to thank I.I. Mazin for helpful discussions. A.M.M. and D.R. were supported by the U.S. Department of Energy (DOE), Office of Basic Energy Sciences, Office of Science, under Contract No.?DE-SC0006939. Theory work (RMF) was supported by the DOE Office of Science, Basic Energy Sciences, under Award No.?DE-SC0020045. This research used resources of the Advanced Photon Source (APS), a DOE Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No.?DE-AC02-06CH11357. Experimental work was carried out at BL43LXU of the RIKEN SPring-8 Center and at Sector 30 (HERIX) of the APS.

Funding Information:
D. R. would like to thank I. I. Mazin for helpful discussions. A. M. M. and D. R. were supported by the U.S. Department of Energy (DOE), Office of Basic Energy Sciences, Office of Science, under Contract No. DE-SC0006939. Theory work (RMF) was supported by the DOE Office of Science, Basic Energy Sciences, under Award No. DE-SC0020045. This research used resources of the Advanced Photon Source (APS), a DOE Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Experimental work was carried out at BL43LXU of the RIKEN SPring-8 Center and at Sector 30 (HERIX) of the APS.

Publisher Copyright:
© 2020 American Physical Society. © 2020 American Physical Society.

PubMed: MeSH publication types

  • Journal Article

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