Journal
SCIENCE
Volume 352, Issue 6288, Pages 958-962Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aab0103
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Funding
- Gabilan Stanford Graduate Fellowship
- NSF Graduate Research Fellowship [DGE-114747]
- Department of Energy, Office of Basic Energy Sciences [DE-AC02-76SF00515]
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A key actor in the conventional theory of superconductivity is the induced interaction between electrons mediated by the exchange of virtual collective fluctuations (phonons in the case of conventional s-wave superconductors). Other collective modes that can play the same role, especially spin fluctuations, have been widely discussed in the context of high-temperature and heavy Fermion superconductors. The strength of such collective fluctuations is measured by the associated susceptibility. Here we use differential elastoresistance measurements from five optimally doped iron-based superconductors to show that divergent nematic susceptibility appears to be a generic feature in the optimal doping regime of these materials. This observation motivates consideration of the effects of nematic fluctuations on the superconducting pairing interaction in this family of compounds and possibly beyond.
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