Impact of nematicity on the relationship between antiferromagnetic fluctuations and superconductivity in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:msub><mml:mi>FeSe</mml:mi><mml:mrow><mml:mn>0.91</mml:mn></mml:mrow></mml:msub><mml:mi mathvariant="normal">S</mml:mi></mml:mrow><mml:mrow><mml:mn>0.09</mml:mn></mml:mrow></mml:msub></mml:math> under pressure
Khusboo Rana, Li Xiang, P. Wiecki, R. A. Ribeiro, G. G. Lesseux, A. E. Böhmer, S.L. Bud’ko, P. C. Canfield, Yuji Furukawa
Abstract
Relationships between nematicity, antiferromagnetism, and superconductivity have been a central theme for studies of iron-based superconductors. When these systems undergo a nematic transition, the fourfold rotational symmetry (C${}_{4}$) of antiferromagnetic correlations reduces to twofold (C${}_{2}$). The positive relationship between antiferromagnetic correlations and superconducting transition temperatures T${}_{c}$ is clearly seen in unconventional superconductors, but does it depend on the symmetry of the correlations? Here, the NMR study on sulfur-doped FeSe systems demonstrates that the relationship changes with the presence/absence of nematicity and also that C${}_{4}$-symmetric antiferromagnetic correlations are better in enhancing T${}_{c}$ than their C${}_{2}$-symmetric counterparts.