Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Screening in YBCO at large wave vectors   We present experimental inelastic x-ray scattering (IXS) and ab initio
time-dependent density-functional-theory (TDDFT) studies of YBa2Cu3O7-{\delta}.
The response of the low-lying Ba 5p and Y 4p core electrons is shown to
interact strongly with the Cu 3d and O 2p excitations, with important
consequences on screening. The agreement between IXS and TDDFT results is
excellent, apart from a new type of excitations, mainly related to loosely
bound Ba electrons and significantly affected by correlations. This points to
correlation mechanisms not fully described by TDDFT that might have a role in
giving rise to antiscreening.

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The categories of this paper are: solv-int
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The categories of this paper are: q-alg
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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: bayes-an
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The categories of this paper are: eess
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The categories of this paper are: econ
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
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The categories of this paper are: math
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The categories of this paper are: mtrl-th
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas