Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: c-Axis Penetration Depth in the Cuprates: Additional Evidence for
  Incoherent Hopping   Measurements of the $c$-axis penetration depth $\lambda_c$ in the cuprates
reveal a low-temperature $T$ dependence which is inconsistent with simple
models of coupling between the CuO$_2$ layers. In this paper, we examine
whether a model based on {\it incoherent} hopping between the layers can
account for this low-$T$ behavior. We compute $\lambda_c$ directly from linear
response theory and compare our results with recent experimental measurements
on $\rm YBa_2u_3O_{7-\delta}$ as a function of temperature and doping. We find
that the data can be reproduced within this model providing the inter-layer
scattering is anisotropic and the pairing is $d$-wave. In addition, our
calculations demonstrate that $1/\lambda_c^2$ is proportional to the $c$-axis
critical current, which seems to be a generic feature in weakly coupled layered
superconductors.

21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
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The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol