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VOLUME 119 (2024) | ISSUE 2 | PAGE 118
Multiband superconductivity in KCa2Fe4As4F2
Abstract
The paper reports complementary studies of the order parameter of the newly discovered iron-based superconductor,KCa2Fe4As4F2 (Tc = 34 K),that consists of alternating blocks of KFe2As2 (122) phase and CaFeAsF (1111) phase.We performed high-resolution intrinsic multiple Andreev reflection spectroscopy supplemented with self-field critical current measurements.Andreev spectra,obtained by means of a break-junction technique reveal two distinct superconducting order parameters - ?L and ?S.Their temperature dependencies were measured from 1.5 K to Tc.The shape of Andreev reflections dips,corresponding to the two gaps,are symmetrical,which is a signature of s-wave order parameter.Temperature dependence of the self-field critical current can also be described by two s-wave gaps model.