Spectroscopic evidence of superconductivity pairing at 83 K in single-layer FeSe/SrTiO<sub>3</sub> films.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 33990574.
- Also identified by DOI 10.1038/s41467-021-23106-y and PMC identifier 8121788.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Single-layer FeSe films grown on the SrTiO<sub>3</sub> substrate (FeSe/STO) have attracted much attention because of their possible record-high superconducting critical temperature (T<sub>c</sub>) and distinct electronic structures. However, it has been under debate on how high its T<sub>c</sub> 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 T<sub>c</sub> as high as 83 K is achievable, or there is a pseudogap formation from superconductivity fluctuation in single-layer FeSe/STO films.