Using detailed angle-resolved photoemission spectroscopy studies, we have identified the changes in the electronic structure and correlations of the nematic superconductors FeSe1-xTex. This work combines both experimental and computational model to be able to identify and quantify precisely the observed effects. Our findings suggests that the dxy hole band, which is very sensitive to the chalcogen height, could be involved in promoting an additional pairing channel and increasing the density of states to stabilize the second superconducting dome in FeSe1−xTex. This simultaneous shift of the dxy hole band and enhanced superconductivity is in contrast with FeSe1−xSx.
The work was published in Communications Physics volume 6, Article number: 362 (2023).