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

Journal Article · · npj Quantum Materials
 [1];  [2];  [3];  [1];  [4];  [5];  [6];  [1];  [7];  [7];  [1];  [1];  [3];  [8]
  1. Leibniz-Institute for Solid State and Materials Research, Dresden (Germany)
  2. Leibniz-Institute for Solid State and Materials Research, Dresden (Germany); Consiglio Nazionale delle Ricerche (CNR), Genoa (Italy)
  3. Leibniz-Institute for Solid State and Materials Research, Dresden (Germany); Technische Universität Dresden (Germany)
  4. Leibniz-Institute for Solid State and Materials Research, Dresden (Germany); Bergische University at Wuppertal (Germany)
  5. Ames Laboratory, and Iowa State University, Ames, IA (United States); Washington University, St. Louis, MO (United States)
  6. Leibniz-Institute for Solid State and Materials Research, Dresden (Germany); Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
  7. Ames Laboratory, and Iowa State University, Ames, IA (United States)
  8. Leibniz-Institute for Solid State and Materials Research, Dresden (Germany); Bergische University at Wuppertal (Germany); Technische Universität Dresden (Germany)
+ Show Author Affiliations
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 Tc. 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.
Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
European Research Council (ERC); German Research Foundation (DFG); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
1886212
Report Number(s):
IS-J-10,883
Journal Information:
npj Quantum Materials, Journal Name: npj Quantum Materials Journal Issue: 1 Vol. 7; ISSN 2397-4648
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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