Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phonon scattering in quasicrystalline i-Al_{72}Pd_{19.5}Mn_{8.5}: A
  study of the low-temperature thermal conductivity   We measured the thermal conductivity of an icosahedral quasicrystal
i-Al_{72}Pd_{19.5}Mn_{8.5} in the temperature range between 0.4 K and 300 K.
The analysis of the low-temperature results was based on a Debye-type model.
The results of the analysis for the two temperature regions of 0.4 K <T<40 K
and 0.4 K <T<1 K, are not consistent in the sense that a tunnelling-states
contribution to phonon scattering is verified only for 0.4 K <T<1 K. The same
fitting procedure indicates that structural defects of the stacking-fault type
are an important source of phonon scattering. Their physical presence was
cleary identified by a transmission electron microscopy experiment.

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The categories of this paper are: quant-ph
3
The categories of this paper are: physics
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The categories of this paper are: math-ph
18
The categories of this paper are: econ
15
The categories of this paper are: nucl-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: ao-sci
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The categories of this paper are: eess
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The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph