Evidence for superconducting gap nodes in the zone-centered hole bands of KFe2As2 from magnetic penetration-depth measurements

K. Hashimoto, A. Serafin, S. Tonegawa +13

Among the iron-based pnictide superconductors the material KFe${}_2$As${}_2$ is unusual in that its Fermi surface does not consist of quasi-nested electron and hole pockets. Here we re…