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A study of the in-plane magnetic penetration depth \lambda_ab in a series ofthe cuprate superconductors Ca_2-xNa_xCuO_2Cl_2 (Na-CCOC) with Na contentx=0.11, 0.12, 0.15, 0.18, and 0.19 is reported. The zero temperature values of\lambda_ab(0) were obtained by means of the muon-spin rotation technique, aswell as from measurements of the intrinsic susceptibility \chi^int(0) by usingthe procedure developed by Kanigel et al. [Phys.Rev.B 71, 224511 (2005)].\lambda_ab at T=0K was found to increase with decreasing doping from\lambda_ab(0)=316(19)nm for the x=0.19 sample to \lambda_ab(0)=430(26)nm forthe x=0.11 one. From a comparison of the present Na-CCOC data with those ofBi2201 and La214 cuprate superconductors it is concluded that substitution ofthe apical oxygen by chlorine decreases the coupling between thesuperconducting CuO_2 planes, leading to an enhancement of the two-dimensionalproperties of Na-CCOC.Comment: 8 pages, 7 figure

physical review. b, condensed matter and materials physics

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In-plane magnetic penetration depthλabinCa2−xNax