Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superconductivity in efficient thermoelectric
  Cu$_3$Sb$_{0.98}$Al$_{0.02}$Se$_4$   Both superconductivity and thermoelectricity offer promising prospects for
daily energy efficiency applications. The advancements of thermoelectric
materials have led to the huge improvement of the thermoelectric figure of
merit in the past decade. By applying pressure on a highly efficient
thermoelectric material Cu$_{3}$Sb$_{0.98}$Al$_{0.02}$Se$_4$, we achieve
dome-shape superconductivity developing at around 8.5 GPa but having a maximum
critical temperature of 3.2 K at pressure of 12.7 GPa. The novel superconductor
is realized through the first-order structural transformation from its initial
phase to an orthorhombic one. The superconducting phase is determined in the
ultimate formation of the Cu-Al-Sb-Se alloy.

36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
30
The categories of this paper are: q-alg