Evolution of quasiparticle excitations with critical mass enhancement in superconducting AFe2As2 (A = K, Rb, and Cs)

Y. Mizukami, Y. Kawamoto, Y. Shimoyama +8

In the heavily hole-doped iron-based superconductors $A$Fe${}_2$As${}_2$ ($A=$ K, Rb, and Cs), the electron effective mass increases rapidly with alkali-ion radius. To study how the ma…