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Theory of the c-Axis Penetration Depth in the Cuprates

R. J. Radtke·V. N. Kostur·K. Levin
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Abstract

Recent measurements of the London penetration depth tensor in the cuprates find a weak temperature dependence along the c-direction which is seemingly inconsistent with evidence for d-wave pairing deduced from in-plane measurements. We demonstrate in this paper that these disparate results are not in contradiction, but can be explained within a theory based on incoherent quasiparticle hopping between the CuO2 layers. By relating the calculated temperature dependence of the penetration depth λ_c(T) to the c-axis resistivity, we show how the measured ratio λ_c^2(0) / λ_c^2(T) can provide insight into the behavior of c-axis transport below Tc and the related issue of ``confinement.''

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R. J. Radtke, V. N. Kostur, K. Levin. 1995-09-27. Theory of the c-Axis Penetration Depth in the Cuprates. https://doi.org/10.1103/physrevb.53.r522

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