Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First Scanning Tunnelling Spectroscopy on Bi2Sr2Ca2Cu3O10 (Bi2223)
  single crystals   We report the first low temperature scanning tunnelling microscopy and
spectroscopy study of high quality Bi2223 crystals. We present atomic
resolution and show spectroscopic data acquired on two different samples. In
one case, for Tc= 109K and a transition width of only 1K, we obtained an
extremely homogeneous sample with a gap value of 60 meV over at least 50 nm. In
the other case, the respective parameters were Tc= 111K with a transition width
of 1.7K and yielded a slightly less homogeneous sample with a gap of 45 meV. We
evidence strong similarities with Bi2Sr2CaCu2O8 (Bi2212) and discuss the doping
level of our samples.

24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom