Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First-Order Structural Change Accompanied by Yb Valence Transition in
  YbInCu4   A diffraction experiment using a high energy x-ray was carried out on
YbInCu4. Below the Yb valence transition temperature, the splitting of Bragg
peaks was detected in higher-order reflections. No superlattice reflections
accompanying the valence ordering were found below the transition temperature.
These experimental findings indicate that a structural change from a cubic
structure to a tetragonal structure without valence ordering occurs at the
transition temperature. Such a structural change free from any valence ordering
is difficult to understand only in terms of Yb valence degrees of freedom. This
means that the structural change may be related to electronic symmetries such
as quadrupolar degrees of freedom as well as the change in Yb valence.

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The categories of this paper are: hep-th
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The categories of this paper are: physics
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The categories of this paper are: q-fin
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The categories of this paper are: q-bio
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The categories of this paper are: econ
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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: atom-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: adap-org
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The categories of this paper are: math
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The categories of this paper are: stat
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The categories of this paper are: funct-an
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The categories of this paper are: astro-ph
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The categories of this paper are: dg-ga