这篇快速通讯报告了对新发现的钙钾铁基超导体CaKFe4As4的研究，利用μ子谱学发现其在零磁场下未显示出时间反演对称性的破坏，支持了超导态的保留。实验结果表明，该材料的超导性质符合两-gap s-wave模型，具有两个能量缺口值8.6(4)和2.5(3)meV，与之前理论和实验研究一致。此外，测得的零场穿透深度为289(22)nm。
摘要：
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 superconductivity in these materials. In this Rapid Communication, we report on the superconducting and magnetic properties of CaKFe4As4, studied using muon spectroscopy. Zero-field muon spin relaxation studies carried out on the CaKFe4As4 superconductor do not show any detectable magnetic anomaly at Tc or below, implying that time-reversal symmetry is preserved in the superconducting ground state. The temperature dependence of the 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 other Fe-based superconductors. The presence of two superconducting energy gaps is consistent 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.
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