Spectroscopic evidence of superconductivity pairing at 83 K in single-layer FeSe/SrTiO3 films
Autor: | Lin Zhao, Yu Xu, Jianwei Huang, Qiang Gao, Yong Hu, Yongqing Cai, Chaohui Yin, Qingyan Wang, Z. G. Zhu, Hao Chen, Cong Li, Dingsong Wu, Hongtao Yan, Hongtao Rong, X. J. Zhou, Zuyan Xu, Yuan Huang, Guodong Liu |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Materials science
Science General Physics and Astronomy FOS: Physical sciences 02 engineering and technology Substrate (electronics) 01 natural sciences General Biochemistry Genetics and Molecular Biology Superconductivity (cond-mat.supr-con) Condensed Matter - Strongly Correlated Electrons Condensed Matter::Materials Science Two temperature Condensed Matter::Superconductivity 0103 physical sciences Superconducting critical temperature 010306 general physics Computer Science::Databases Superconductivity Condensed Matter - Materials Science Multidisciplinary Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) Condensed Matter - Superconductivity Materials Science (cond-mat.mtrl-sci) General Chemistry 021001 nanoscience & nanotechnology Pairing Superconducting transition temperature 0210 nano-technology Pseudogap Single layer |
Zdroj: | Nature Communications, Vol 12, Iss 1, Pp 1-9 (2021) |
ISSN: | 2041-1723 |
Popis: | 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 in iron-based superconductors. However, it has been under debate on how high its Tc can really reach due to the inconsistency of the results obtained from the transport, magnetic and spectroscopic 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 for the first time strong superconductivity-induced Bogoliubov back-bending bands that extend to rather high binding energy ~100 meV by high-resolution angle-resolved photoemission measurements. The Bogoliubov back-bending band provides a new definitive benchmark of superconductivity pairing that is directly observed up to 83 K in the single-layer FeSe/STO films. Moreover, we find that the superconductivity pairing state can be further divided into two temperature regions of 64-83 K and below 64 K. We propose the 64-83 K region may be attributed to superconductivity fluctuation while the region below 64 K corresponds to the realization of long-range superconducting phase coherence. These results indicate that either Tc as high as 83 K is achievable in iron-based superconductors, or there is a pseudogap formation from superconductivity fluctuation in single-layer FeSe/STO films. |
Databáze: | OpenAIRE |
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