Ubiquitous enhancement of nematic fluctuations across the phase diagram of iron 
based superconductors probed by the Nernst effect

Wuttke, Christoph; Caglieris, Federico; Sykora, Steffen; Steckel, Frank; Hong, Xiaochen; Ran, Sheng; Khim, Seunghyun; Kappenberger, Rhea; Bud'ko, Sergey L.; Canfield, Paul C.; Wurmehl, Sabine; Aswartham, Saicharan; Buechner, Bernd; Hess, Christian

doi:10.1038/s41535-022-00487-x

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Ubiquitous enhancement of nematic fluctuations across the phase diagram of iron based superconductors probed by the Nernst effect

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Khim, Seunghyun
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Wuttke, C., Caglieris, F., Sykora, S., Steckel, F., Hong, X., Ran, S., et al. (2022). Ubiquitous enhancement of nematic fluctuations across the phase diagram of iron based superconductors probed by the Nernst effect. npj Quantum Materials, 7(1): 82, pp. 1-10. doi:10.1038/s41535-022-00487-x.

Cite as: https://hdl.handle.net/21.11116/0000-000A-F0CA-3

Abstract

The role of nematic fluctuations for unconventional superconductivity has been the subject of intense discussions for many years. In iron-based superconductors, the most established probe for electronic-nematic fluctuations, i.e. the elastoresistivity seems to imply that superconductivity is reinforced by electronic-nematic fluctuations, since the elastoresistivity amplitude peaks at or close to optimal T-c. However, on the over-doped side of the superconducting dome, the diminishing elastoresistivity suggests a negligible importance in the mechanism of superconductivity. Here we introduce the Nernst coefficient as a genuine probe for electronic nematic fluctuations, and we show that the amplitude of the Nernst coefficient tracks the superconducting dome of two prototype families of iron-based superconductors, namely Rh-doped BaFe2As2 and Co-doped LaFeAsO. Our data thus provide fresh evidence that in these systems, nematic fluctuations foster the superconductivity throughout the phase diagram.