Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Doping Effects on the Electronic Structure of an Anisotropic Kondo
  Semiconductor CeOs$_2$Al$_{10}$: An Optical Study with Re and Ir Substitution   An anisotropic Kondo semiconductor CeOs$_2$Al$_{10}$ exhibits an unusual
antiferromagnetic order at rather high transition temperature $T_0$ of 28.5 K.
Two possible origins of the magnetic order have been proposed so far, one is
the Kondo coupling of the hybridization between the conduction ($c$) and the
$4f$ states and the other is the charge-density wave/charge ordering along the
orthorhombic $b$ axis. To clarify the origin of the magnetic order, we have
investigated the electronic structure of hole- and electron-doped
CeOs$_2$Al$_{10}$ [Ce(Os$_{1-y}$Re$_y$)$_2$Al$_{10}$ and
Ce(Os$_{1-x}$Ir$_x$)$_2$Al$_{10}$, respectively] by using optical conductivity
spectra along the $b$ axis. The intensity of the $c$-$f$ hybridization gap at
$\hbar\omega\sim50$ meV continuously decreases from $y=0.10$ to $x=0.12$ via
$x=y=0$. The intensity of the charge excitation observed at $\hbar\omega\sim20$
meV has the maximum at $x=y=0$ as similar with the doping dependence of $T_{\rm
0}$. The fact that the charge excitation is strongly related to the magnetic
order strengthens the possibility of the charge density wave/charge ordering as
the origin of the magnetic order.

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The categories of this paper are: alg-geom
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The categories of this paper are: astro-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-lat
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The categories of this paper are: ao-sci
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The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: nlin
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The categories of this paper are: nucl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: hep-ex
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The categories of this paper are: math
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The categories of this paper are: adap-org