Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superconducting coherence peak in the electronic excitations of a single
  layer cuprate superconductor $Bi_2 Sr_{1.6} La_{0.4} Cu O_{6+\delta}$   Angle resolved photoemission spectroscopy study is reported on a high quality
optimally doped Bi2Sr1.6La0.4CuO6+delta high Tc superconductor. In the
antinodal region with maximal d-wave gap, the symbolic superconducting
coherence peak, which has been widely observed in multi-CuO2-layer cuprate
superconductors, is unambiguously observed in a single layer system. The
associated peak-dip separation is just about 19 meV, which is much smaller than
its counterparts in multi-layered compounds, but correlates with the energy
scales of spin excitations in single layer cuprates.

2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
15
The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph