Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superfluid anisotropy in YBCO: Evidence for pair tunneling
  superconductivity   Proximity effect and pair tunneling models are applied as alternative
scenarios to explain the recently measured $ab$-plane and $c$-axis components
of the superfluid tensor in Copper-Oxide superconductors which contain chains,
such as $YBa_2Cu_3O_{6.95}$. It is argued that conventional proximity effect
models, which couple chains and planes via single electron tunneling only, are
incompatible with the experimental observations. On the other hand several
surprising features of the experimental data are readily explained by the
presence of a microscopic pair tunneling process.

25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci