Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Oxygen Phonon Branches in Detwinned YBa2Cu3O7   We report results of inelastic neutron scattering measurements of phonon
dispersions on a detwinned sample of YBaCu3O7 and compare them with model
calculations. Plane oxygen bond stretching phonon branches disperse steeply
downwards from the zone center in both the a and the b direction indicating a
strong electron-phonon coupling. Half way to the zone boundary, the phonon
peaks become ill-defined but we see no need to invoke unit cell doubling or
charge stripe formation: lattice dynamical shell model calculations predict
such behavior as a result of branch anticrossings. There were no observable
superconductivity-related temperature effects on selected plane oxygen bond
stretching modes measured on a twinned sample.

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The categories of this paper are: comp-gas
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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: adap-org
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The categories of this paper are: math
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: dg-ga
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The categories of this paper are: bayes-an
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The categories of this paper are: alg-geom
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The categories of this paper are: econ
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The categories of this paper are: supr-con
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The categories of this paper are: chem-ph
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: gr-qc