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
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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