Spectroscopic evidence of superconductivity pairing at 83 K in single-layer FeSe/SrTiO 3 films.
Yu Xu,Hongtao Rong,Qingyan Wang,Dingsong Wu,Yong Hu,Yongqing Cai,Qiang Gao,Hongtao Yan,Cong Li,Chaohui Yin,Hao Chen,Jianwei Huang,Z. G. Zhu,Yuan Huang,Guodong Liu,Zuyan Xu,Lin Zhao,X. J. Zhou +17 more
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In this article, the authors used Bogoliubov back-bending bands as a benchmark and demonstrate that superconductivity pairing can be realized up to 83 K in single-layer FeSe/SrTiO3 films.Abstract:
Single-layer FeSe films grown on the SrTiO3 substrate (FeSe/STO) have attracted much attention because of their possible record-high superconducting critical temperature (Tc) and distinct electronic structures. However, it has been under debate on how high its Tc can really reach due to the inconsistency of the results from different measurements. Here we report spectroscopic evidence of superconductivity pairing at 83 K in single-layer FeSe/STO films. By preparing high-quality single-layer FeSe/STO films, we observe strong superconductivity-induced Bogoliubov back-bending bands that extend to rather high binding energy ~ 100 meV by high-resolution angle-resolved photoemission measurements. They provide a new definitive benchmark of superconductivity pairing that is directly observed up to 83 K. Moreover, we find that the pairing state can be further divided into two temperature regions. These results indicate that either Tc as high as 83 K is achievable, or there is a pseudogap formation from superconductivity fluctuation in single-layer FeSe/STO films. How high the superconducting transition temperature can reach in single layer FeSe/SrTiO3 films has been under debate. Here, the authors use Bogoliubov back-bending bands as a benchmark and demonstrate that superconductivity pairing can be realized up to 83 K in this system.read more
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References
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Superconductivity in the PbO-type structure α-FeSe
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TL;DR: The pseudogap is seen in all high-temperature superconductors and there is general agreement on the temperature and doping range where it exists as discussed by the authors, and it is also becoming clear that the superconducting gap emerges from the normal state pseudogaps.
Journal ArticleDOI
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TL;DR: In this article, the phase of the order parameter is not important for determining the value of the transition temperature Tc and the change of many physical properties brought about by the transition, and the phase fluctuations, both classical and quantum, may have a significant influence on low-temperature properties.
Journal ArticleDOI
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Journal ArticleDOI
Interface-Induced High-Temperature Superconductivity in Single Unit-Cell FeSe Films on SrTiO3
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TL;DR: In this paper, the authors reported high transition temperature superconductivity in one unitcell (UC) thick FeSe films grown on a Se-etched SrTiO3 (001) substrate by molecular beam epitaxy (MBE).