Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin polarization of (Ga,Mn)As measured by Andreev Spectroscopy: The
  role of spin-active scattering   We investigate the spin-polarization of the ferromagnetic semiconductor
(Ga,Mn)As by point contact Andreev reflection spectroscopy. The conductance
spectra are analyzed using a recent theoretical model that accounts for
momentum- and spin-dependent scattering at the interface. This allows us to fit
the data without resorting, as in the case of the standard spin-dependent
Blonder-Tinkham-Klapwijk (BTK) model, to an effective temperature or a
statistical distribution of superconducting gaps. We find a transport
polarization PC{\approx}57%, in considerably better agreement with the
k{\cdot}p kinetic-exchange model of (Ga,Mn)As, than the significantly larger
estimates inferred from the BTK model. The temperature dependence of the
conductance spectra is fully analyzed.

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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex
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The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
2
The categories of this paper are: math