Role of Nematic Fluctuations on Superconductivity in FeSe$_{0.47}$Te$_{0.53}$ Revealed by NMR under Pressure
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| Format: | Preprint |
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2025
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| _version_ | 1866915380349370368 |
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| author | Ding, Qing-Ping Schmidt, Juan Moreno, Jose A. Bud'ko, Sergey L. Canfield, Paul C. Furukawa, Yuji |
| author_facet | Ding, Qing-Ping Schmidt, Juan Moreno, Jose A. Bud'ko, Sergey L. Canfield, Paul C. Furukawa, Yuji |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_11732 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Role of Nematic Fluctuations on Superconductivity in FeSe$_{0.47}$Te$_{0.53}$ Revealed by NMR under Pressure Ding, Qing-Ping Schmidt, Juan Moreno, Jose A. Bud'ko, Sergey L. Canfield, Paul C. Furukawa, Yuji Superconductivity Strongly Correlated Electrons 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. |
| title | Role of Nematic Fluctuations on Superconductivity in FeSe$_{0.47}$Te$_{0.53}$ Revealed by NMR under Pressure |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2505.11732 |