Physics – Condensed Matter – Superconductivity
Scientific paper
2002-08-15
PRL 89, p.149703 (2002)
Physics
Condensed Matter
Superconductivity
2 pages, 1 figure, accepted in PRL
Scientific paper
10.1103/PhysRevLett.89.149703
Recently, Kotzler et al. measured the frequency-dependent conductance for YBa_2Cu_3O_7 and interpreted their results as evidences that the decay of the superfluid density is caused by a 3D vortex loop proliferation mechanism and a dimensional crossover when the correlation length $\xi_c$ along the c axis becomes comparable to the sample thickness $d$ [PRL 87, 127005(2001)]. In this Comment, we show that the complex conductance data presented by Kotzler et al. have characteristic key features not compatible with their analysis, which are instead described by the existing phenomenology of 2D vortex fluctuation associated with a partial decoupling of CuO_2-planes.
Kim Beom Jun
Medvedyeva Kateryna
Minnhagen Petter
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