Study of the in-plane magnetic penetration depth in the cuprate superconductor Ca2-xNaxCuO2Cl2: role of the apical sites
Abstract
A study of the in-plane magnetic penetration depth λab in a series of the cuprate superconductors Ca2-xNaxCuO2Cl2 (Na-CCOC) with Na content x=0.11, 0.12, 0.15, 0.18, and 0.19 is reported. The zero temperature values of λab(0) were obtained by means of the muon-spin rotation technique, as well as from measurements of the intrinsic susceptibility int(0) by using the procedure developed by Kanigel et al. [Phys.Rev.B 71, 224511 (2005)]. λab at T=0K was found to increase with decreasing doping from λab(0)=316(19)nm for the x=0.19 sample to λab(0)=430(26)nm for the x=0.11 one. From a comparison of the present Na-CCOC data with those of Bi2201 and La214 cuprate superconductors it is concluded that substitution of the apical oxygen by chlorine decreases the coupling between the superconducting CuO2 planes, leading to an enhancement of the two-dimensional properties of Na-CCOC.
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