Publication date: 10th April 2024
The brownmillerite phase of strontium cobaltite (SrCoO2.5) is an insulating antiferromagnet while the perovskite phase (SrCoO3) is a ferromagnetic metal. Relatively small changes to the oxygen concentration can drive a reversible, topotactic phase transition, making SrCoO3-δ a material of interest for ionotronic applications. While the electronic and magnetic properties of such oxides have been subjects of considerable interest, much concerning the kinetics and dynamics of oxygen vacancies remain unknown.
With the coherent X-rays available at the Advanced Photon Source, we can monitor in-situ the behavior of oxygen vacancies in epitaxial SrCoO3-δ thin films and bilayers grown on both SrTiO3 (001) and (LaAlO3)0.3(Sr2TaAlO6)0.7 (001). This allowed studies of oxygen migration in and out of the cobaltite under different conditions, providing insight into the kinetics and dynamics of oxygen-induced phase evolution in complex oxide heterostructures. From X-ray photon correlation spectroscopy performed at the brownmillerite superlattice reflection, we find that the oxygen vacancy dynamics is sensitive to epitaxial strain and electric field strength. We will discuss the kinetics and dynamics of the oxygen vacancy ordering transition and the methods used to distinguish the different mechanisms taking place.
Work supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division.
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