Screening in YBCO at large wave vectors

Details Screening in YBCO at large wave vectors Screening in YBCO at large wave vectors

2010-11-05

arxiv.org/abs/1011.1436v1

Phys. Rev. B 82, 064514 (2010)

Physics

Condensed Matter

Superconductivity

6 pages, 3 figures

Scientific paper

10.1103/PhysRevB.82.064514

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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