Signature of multigap nodeless superconductivity in CaKFe4As4

P. K. Biswas, A. Iyo, Y. Yoshida +3

A newly discovered family of high-Tc Fe-based superconductors, AeAFe4As4 (Ae = Ca, Sr, Eu and A = K, Rb, Cs), offers further opportunities to understand unconventional superconduct…