Separate tuning of nematicity and spin fluctuations to unravel the origin of superconductivity in FeSe

Abstract

The interplay of orbital and spin degrees of freedom is the fundamental characteristic in numerous condensed matter phenomena, including high temperature superconductivity, quantum spin liquids, and topological semimetals. In iron-based superconductors (FeSCs), this causes superconductivity to emerge in the vicinity of two other instabilities: nematic and magnetic. Unveiling the mutual relationship among nematic order, spin fluctuations, and superconductivity has been a major challenge for research in FeSCs, but it is still controversial. Here, by carrying out 77Se nuclear magnetic resonance (NMR) measurements on FeSe single crystals, doped by cobalt and sulfur that serve as control parameters, we demonstrate that the superconducting transition temperature Tc increases in proportion to the strength of spin fluctuations, while it is independent of the nematic transition temperature Tnem. Our observation therefore directly implies that superconductivity in FeSe is essentially driven by spin fluctuations in the intermediate coupling regime, while nematic fluctuations have a marginal impact on Tc.

arXiv comment20 pages, 3 figures; includes supplementary materials (1 note and 3 figures)

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Cited by in corpus (15)

• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Electronic nematic states tuned by isoelectronic substitution in bulk FeSe1-xSx
• Unconventional density waves and superconductivities in Fe-based superconductors and other strongly correlated electron systems
• Eliashberg theory for spin-fluctuations mediated superconductivity -- Application to bulk and monolayer FeSe
• The drastic effect of the impurity scattering on the electronic and superconducting properties of Cu-doped FeSe
• Impact of Nematicity on the Relationship between Antiferromagnetic Fluctuations and Superconductivity in FeSe0.91S0.09 Under Pressure
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• Nematicity in LaFeAsO single crystals studied by elastoresistance, high-resolution thermal expansion and shear-modulus measurements