Hans M. Christen

TL;DR: The data reveal that the specific interface structure and local asymmetries play an unexpected role in the polarization enhancement, and it is shown that even superlattices containing only single-unit-cell layers of BaTiO3 in a paraelectric matrix remain ferroelectric.

TL;DR: In this article, the surface secondary phases on a (001)-oriented La 0.8Sr0.2CoO3−δ (LSC) film became smaller than that on an LSC powder pellet at elevated temperatures.

TL;DR: Using an aberration-corrected scanning transmission electron microscope, the spectroscopic imaging of single La atoms inside CaTiO3 is demonstrated and it is shown how the depth of the atom within the crystal may be estimated.

TL;DR: An approach for direct mapping of oxygen vacancy concentrations based on local lattice parameter measurements by scanning transmission electron microscopy is developed and the concept of chemical expansivity is demonstrated to be applicable on the subunit-cell level: local stoichiometry variations produce local lattices expansion that can be quantified.

TL;DR: Detailed growth kinetics results are discussed, which illustrate that 'true' layer-by-layer (LBL) growth can only be approached, not fully met, even though many characterization techniques reveal interfaces with unexpected sharpness.