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Paper detail

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-δ. 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.

preprint2010arXivOpen access
Simo HuotariJ. Aleksi SoininenGyörgy VankóGiulio MonacoValerio Olevano
cond-mat.supr-concond-mat.str-elcond-mat.mtrl-sci
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Simo HuotariJ. Aleksi SoininenGyörgy VankóGiulio MonacoValerio Olevano

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