تقرير
Onset Temperatures for Superconducting Fluctuations in Te-annealed FeTe$_{1-x}$Se$_x$ Single Crystals: Evidence for the BCS-BEC Crossover
| العنوان: | Onset Temperatures for Superconducting Fluctuations in Te-annealed FeTe$_{1-x}$Se$_x$ Single Crystals: Evidence for the BCS-BEC Crossover |
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| المؤلفون: | Uezono, Yu, Otsuka, Takumi, Hagisawa, Shotaro, Taniguchi, Haruka, Matsukawa, Michiaki, Fujii, Takenori, Watanabe, Takao |
| سنة النشر: | 2022 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity |
| الوصف: | Recently, the superconductors' community has witnessed an unsettled debate regarding whether iron-based superconductors, in particular FeSe and FeSe$_{1-x}$S$_x$, are in the Bardeen-Cooper-Shrieffer (BCS) - Bose-Einstein condensation (BEC) crossover regime. Nonetheless, one particular system, FeTe$_{1-x}$Se$_x$, has been less investigated in this regard owing to the screening of its intrinsic superconducting properties by the inevitable iron excess. Herein, the onset temperatures for superconducting fluctuations ($T_{scf}$) are investigated by measuring the magnetoresistance (MR) of Te-annealed, high-quality FeTe$_{1-x}$Se$_x$ ($x$ = 0.1, 0.2, 0.3, and 0.4) single crystals. The results reveal very high $T_{scf}$ values for these crystals. Particularly for $x$ = 0.4, $T_{scf}$ reaches approximately 40 K, which is 2.7 times larger than $T_c$. This indicates that the superconductivity of the FeTe$_{1-x}$Se$_x$ system is well within the BCS-BEC crossover regime. Comment: 6 pages, 3 figures, and 1 table. to be published in JPS Conference Proceedings |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.7566/JPSCP.38.011023 |
| URL الوصول: | http://arxiv.org/abs/2209.08238 |
| رقم الأكسشن: | edsarx.2209.08238 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.7566/JPSCP.38.011023 |
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