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Atomic scale crystal field mapping of polar vortices in oxide superlattices

Abstract: Polar vortices in oxide superlattices exhibit complex polarization topologies. Using a combination of electron energy loss near-edge structure analysis, crystal field multiplet theory, and first-principles calculations, we probe the electronic structure within such polar vortices in [(PbTiO3)16/(SrTiO3)16] superlattices at the atomic scale. The peaks in Ti L-edge spectra shift systematically depending on the position of the Ti4+ cations within the vortices i.e., the direction and magnitude of the local dipole. First-principles computation of the local projected density of states on the Ti 3d orbitals, together with the simulated crystal field multiplet spectra derived from first principles are in good agreement with the experiments.

 Autoría: Susarla S., García-Fernández P., Ophus C., Das S., Aguado-Puente P., McCarter M., Ercius P., Martin L.W., Ramesh R., Junquera J.,

 Fuente: Nature Communications, 2021, 12 (1), 6273

 Editorial: Nature Publishing Group

 Fecha de publicación: 01/11/2021

 Nº de páginas: 7

 Tipo de publicación: Artículo de Revista

 DOI: 10.1038/s41467-021-26476-5

 ISSN: 2041-1723

 Proyecto español: PGC2018-096955-B-C41

 Url de la publicación: https://doi.org/10.1038/s41467-021-26476-5

Autoría

SUSARLA, SANDHYA

OPHUS, COLIN

DAS, SUJIT

MCCARTER, MARGARET

ERCIUS, PETER

MARTIN, LANE W.