Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tunneling spectroscopy of Tl2Ba2CaCu2O8 single crystals and thin films   Early electron tunneling experiments with the Tl2Ba2CaCu2O8 measured \Delta =
16-28 meV, while bulk optical experiments measured \Delta = 43-45 meV. We
report new tunneling measurements of Tl2Ba2CaCu2O8 single crystals and c-axis
oriented thin films, where the measured \Delta values on both sample types
cover the range of 24-50 meV, with more than 70% of the junctions displaying
\Delta > 30 meV. This work resolves the inconsistency between previously
published results of tunneling and optical experiments. New tunneling
conductances reveal improved superconducting gap region characteristics
consistent with d-wave symmetry. The tunneling spectra also display features
similar to the dip feature observed in Bi2Sr2CaCu2O8. We discuss our results in
context of experiments reported previously on related materials.

9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc