Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charge carrier density, mobility and Seebeck coefficient of melt-grown
  bulk ZnGa2O4 single crystals   The temperature dependence of the charge carrier density, mobility and
Seebeck coefficient of melt-grown, bulk ZnGa2O4 single crystals was measured
between 10 K and 310 K. The electrical conductivity at room temperature is
about s = 286 S/cm due to a high electron concentration of n = 3.26*10^(19)
cm^(-3), caused by unintenional doping. The mobility at room temperature is mu
= 55 cm^2/Vs, whereas the scattering on ionized impurities limits the mobility
to mu =62 cm^2/Vs for temperatures lower than 180 K. The Seebeck coefficient
relative to aluminum at room temperature is S_(ZnGa2O4-Al) = (-125+-2) muV/K
and shows a temperature dependence as expected for degenerate semiconductors.
At low temperatures, around 60 K we observed a maximum of the Seebeck
coefficient due to the phonon drag effect.

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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-th
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: nlin
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys