Cyclotron resonance and mass enhancement by electron correlation in KFe${}_2$As${}_2$

Motoi Kimata, Taichi Terashima, Nobuyuki Kurita +15

Cyclotron resonance (CR) measurements for the Fe-based superconductor KFe${}_2$As${}_2$ are performed. One signal for CR is observed, and is attributed to the two-dimensional $\alpha$ Fermi…