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A newly discovered family of high-Tc Fe-based superconductors, AeAFe4As4 (Ae= Ca, Sr, Eu and A = K, Rb, Cs), offers further opportunities to understandunconventional superconductivity in these materials. In this RapidCommunication, we report on the superconducting and magnetic properties ofCaKFe4As4, studied using muon spectroscopy. Zero-field muon spin relaxationstudies carried out on the CaKFe4As4 superconductor do not show any detectablemagnetic anomaly at Tc or below, implying that time-reversal symmetry ispreserved in the superconducting ground state. The temperature dependence ofthe superfluid density of CaKFe4As4 is found to be compatible with a two-gap s+ s-wave model with gap values of 8.6(4) and 2.5(3) meV, similar to the otherFe-based superconductors. The presence of two superconducting energy gaps isconsistent with theoretical and other experimental studies on this material.The value of the penetration depth at T = 0 K has been determined as 289(22)nm.

Signature of multigap nodeless superconductivity in CaKFe4As4