2025/05/16 by Qing-Ping Ding, Ding, Qing-Ping, Juan Schmidt +9
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Iron-based superconductors research #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.2505.11732
openalex publication_date 2025/05/16 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 77Se and 125Te 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.