Abstract
We report combined experimental and theoretical analysis of superconductivity in (CaK1144) for , 0.017, and 0.034. To obtain the superfluid density , the temperature dependence of the London penetration depth was measured by using a tunnel-diode resonator (TDR) and the results agreed with the microwave coplanar resonator (MWR) with the small differences accounted for by considering a three orders of magnitude higher frequency of MWR. The absolute value of was measured by using MWR, nm, which agreed well with the NV centers in diamond optical magnetometry that gave nm. The experimental results are analyzed within the Eliashberg theory, showing that the superconductivity of CaK1144 is well described by the nodeless order parameter and that upon Ni doping the interband interaction increases.
- Received 13 May 2019
- Revised 12 July 2019
- Corrected 6 April 2021
DOI:https://doi.org/10.1103/PhysRevB.100.094513
©2019 American Physical Society
Physics Subject Headings (PhySH)
Corrections
6 April 2021
Correction: A unit of measure in the last column of Table I contained a typographical error and has been fixed.