Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment to: Correlation Between Superfluid Density and T_{c} of
  Underdoped YBa2Cu3O6+x Near the Superconductor-Insulator Transition   Zuev et al. reported measurements of the in-plane magnetic penetration depth
of supposedly underdoped films of YBa2Cu3O6+x, with Tc from 6 to 50 K. They
argue that their data is inconsistent with a linear relationship between Tc and
the inversw of the T=0 in-plane penetration depth squared, as expected for a
two dimensional quantum superconductor to insulator (2D-QSI) transition where
Tc vanishes and the anisotropy diverges. It is shown that the data of Zuev et
al. do not fall onto the regime where the linear relationship applies, because
the observed reduction of Tc is not associated with an increase of the
anisotropy.

16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
12
The categories of this paper are: nucl-th
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math