Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Enhanced thermopower in an intergrowth cobalt oxide
  Li$_{0.48}$Na$_{0.35}$CoO$_{2}$   We report the measurements of thermopower, electrical resistivity and thermal
conductivity in a complex cobalt oxide Li$_{0.48}$Na$_{0.35}$CoO$_{2}$, whose
crystal structure can be viewed as an intergrowth of the O3 phase of
Li$_{x}$CoO$_{2}$ and the P2 phase of Na$_{y}$CoO$_{2}$ along the c axis. The
compound shows large room-temperature thermopower of $\sim$180 $\mu$V/K, which
is substantially higher than those of Li$_{x}$CoO$_{2}$ and Na$_{y}$CoO$_{2}$.
The figure of merit for the polycrystalline sample increases rapidly with
increasing temperature, and it achieves nearly 10$^{-4}$ K$^{-1}$ at 300 K,
suggesting that Li$_{x}$Na$_{y}$CoO$_{2}$ system is a promising candidate for
thermoelectric applications.

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The categories of this paper are: hep-ph
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The categories of this paper are: math
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The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: quant-ph