Decoupled interband pairing in a bilayer iron-based superconductor evidenced by ultrahigh-resolution ARPES

Shichong Wang, Yuanyuan Yang, Yang Li +11

We present direct experimental evidence of a weakly coupled multiband superconducting state in the bilayer iron-based superconductor ACa${}_2$Fe${}_4$As${}_4$F${}_2$ (A = K, Cs) via ultrah…