Abstract
The authors use angle-resolved photoemission spectroscopy to show distinct electronic structures with different orbital characters between pristine FeSe and high-$T$${}_{c}$ FeSe${}_{1\ensuremath{-}x}$Te${}_{x}$ superconductors.
Highlights
We perform systematic high-resolution angle-resolved photoemission spectroscopy of iron-chalcogenide superconductor FeSe1−xTex films on CaF2 which exhibit a unique paramagnetic nematicity at x = 0 and a gigantic Tc enhancement at the critical Te concentration of x ∼ 0.2
These results demonstrate that the pristine and high-Tc FeSe1−xTex have distinctly different electronic structures
The nematic state is widely observed near the superconducting state in iron-based superconductors, so particular interest is focused on the interplay between nematicity and superconductivity
Summary
Upon increasing the Te concentration from x = 0, the electronlike Fermi-surface shape at the Brillouin-zone corner shows a clear change associated with a remarkable energy shift of the dxz/yz orbital, indicative of the suppression of nematicity near xc.
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