Abstract:Recently, Kötzler et al.[1] measured the frequencydependent conductance for YBa 2 Cu 3 O 7 and interpreted their results as evidence that the decay of the superfluid density is caused by a 3D vortex-loop proliferation mechanism and a dimensional crossover when the correlation length c along the c axis becomes comparable to the sample thickness d. In this Comment, we show that the complex conductance data presented in Ref.[1] have characteristic key features not compatible with their analysis, which are instead… Show more
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