Role of Nematic Fluctuations on Superconductivity in FeSe0.47Te0.53 Revealed by Nuclear Magnetic Resonance under Pressure
Qing-Ping Ding, Juan Schmidt, Jose A. Moreno, Sergey L. Bud’ko, Paul C. Canfield, Yuji Furukawa
DOI 10.1103/kxth-gxvm · Physical Review Letters
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Abstract
The relationship between antiferromagnetic (AFM) spin fluctuations (SF), nematic fluctuations, and superconductivity (SC) has been central to understanding the pairing mechanism in iron-based superconductors (IBSCs). Iron chalcogenides, which hold the simplest crystal structure in IBSCs, provide a good platform to investigate the relationship. Here, we report Se77 and Te125 nuclear magnetic resonance studies of FeSe0.47Te0.53, which is located close to a nematic quantum critical point (QCP), under pressures up to 1.35 GPa. Both the superconducting critical temperature and AFMSF were found to be enhanced under pressure, which suggests a correlation between SC and AFMSF in FeSe0.47Te0.53. However, the contribution of AFMSF to SC in FeSe0.47Te0.53 was found to be much less compared to that in FeSe1−xSx, suggesting that nematic fluctuations play a dominant role in the SC in FeSe1−xTex around the nematic QCP.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeSe0.47Te0.53 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 14.7 | Pressure unresolved | unknown |
| FeSe0.47Te0.53 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17.6 | 0.55 GPa | unknown |
| FeSe0.47Te0.53 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 19.8 | 1.35 GPa | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.5 | Pressure unresolved | unknown |
| FeS Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure unresolved | unknown |
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