Role of Nematic Fluctuations on Superconductivity in FeSe_{0.47}Te_{0.53} Revealed by Nuclear Magnetic Resonance
Qing-Ping Ding1, Juan Schmidt1,2, Jose A Moreno1,3
1Ames National Laboratory, U.S. DOE, Ames, Iowa 50011, USA.
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 ^{77}Se and ^{125}Te nuclear magnetic resonance studies of FeSe_{0.47}Te_{0.53}, 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 FeSe_{0.47}Te_{0.53}. However, the contribution of AFMSF to SC in FeSe_{0.47}Te_{0.53} was found to be much less compared to that in FeSe_{1-x}S_{x}, suggesting that nematic fluctuations play a dominant role in the SC in FeSe_{1-x}Te_{x} around the nematic QCP.
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