Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: YbGaGe: normal thermal expansion   We report evidence of the absence of zero thermal expansion in
well-characterized high-quality polycrystalline samples of YbGaGe. High-quality
samples of YbGaGe were produced from high-purity starting elements and were
extensively characterized using x-ray powder diffraction, differential thermal
analysis, atomic emission spectroscopy, magnetization, and neutron powder
diffraction at various temperatures. Our sample melts congruently at 920 C. A
small amount of Yb2O3 was found in our sample, which explains the behavior of
the magnetic susceptibility. These observations rule out the scenario of
electronic valence driven thermal expansion in YbGaGe. Our studies indicate
that the thermal expansion of YbGaGe is comparable to that of Cu.

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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: math-ph
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The categories of this paper are: cs
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The categories of this paper are: acc-phys
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The categories of this paper are: supr-con
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The categories of this paper are: math
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The categories of this paper are: nlin
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The categories of this paper are: stat
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The categories of this paper are: dg-ga