Origin of the superconducting state in the collapsed tetragonal phase of KFe2As2

Daniel Guterding, Steffen Backes, Harald O. Jeschke +1

Recently, KFe${}_2$As${}_2$ was shown to exhibit a structural phase transition from a tetragonal to a collapsed tetragonal phase under applied pressure of about $15\mathrm{GPa}$. Surp…