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; Büchner, Bernd; Hess, Christian

doi:10.1038/s41535-022-00487-x

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

Journal Article · Sat Aug 20 00:00:00 EDT 2022 · npj Quantum Materials

DOI:https://doi.org/10.1038/s41535-022-00487-x· OSTI ID:1886212

^[1];

^[2]; Sykora, Steffen ^[3]; Steckel, Frank ^[1];

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^[6]; Kappenberger, Rhea ^[1];

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^[7]; Wurmehl, Sabine ^[1];

^[1]; Büchner, Bernd ^[3];

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Leibniz-Institute for Solid State and Materials Research, Dresden (Germany)
Leibniz-Institute for Solid State and Materials Research, Dresden (Germany); Consiglio Nazionale delle Ricerche (CNR), Genoa (Italy)
Leibniz-Institute for Solid State and Materials Research, Dresden (Germany); Technische Universität Dresden (Germany)
Leibniz-Institute for Solid State and Materials Research, Dresden (Germany); Bergische University at Wuppertal (Germany)
Ames Laboratory, and Iowa State University, Ames, IA (United States); Washington University, St. Louis, MO (United States)
Leibniz-Institute for Solid State and Materials Research, Dresden (Germany); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
Ames Laboratory, and Iowa State University, Ames, IA (United States)
Leibniz-Institute for Solid State and Materials Research, Dresden (Germany); Bergische University at Wuppertal (Germany); Technische Universität Dresden (Germany)

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.

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Research Organization:: Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; German Research Foundation (DFG); European Research Council (ERC)

Grant/Contract Number:: AC02-07CH11358; CA1931/1-1; GRK1621; 647276-MARS-ERC-2014-CoG; ME4844/1-1; AS 523/4-1

OSTI ID:: 1886212

Report Number(s):: IS-J-10,883

Journal Information:: npj Quantum Materials, Vol. 7, Issue 1; ISSN 2397-4648

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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