Compressive Strain-Tuned Epitaxial Nature and Physical Properties of Double-Perovskite PrBaCo₂O_5.5+δ Thin Films

Abstract

Double-perovskite PrBaCo2O5.5+δ thin films were grown on (001) LaAlO3 substrates for investigating the processing dynamic-tuned epitaxial nature and physical properties under different oxygen contents. Microstructural studies reveal that the as-grown films are c-axis oriented with good single crystallinity and epitaxial quality. It is interesting to find that a strained layer (SL) can be formed at the interface between the substrate and the film under a short-time annealing processing for partially releasing the interface compressive strain energy. The electrical and magnetic transport property studies demonstrate that the resistivity, the ferromagnetic states, and the magnetic moment of the films are sensitive to the oxygen content and nature of interface SL. These findings suggest that the microstructure and thus the physical properties of perovskite complex oxides can be manipulated not only by different annealing environments but also by annealing oxygen kinetics, which provides new information for investigating multifunctional complex oxide systems.

Controlling surface cation segregation in a double perovskite for oxygen anion transport in high temperature energy conversion devices

“…66 Similarly, tensile strain up to 0.5% is produced when PrBaCo 2 O 5+ δ is grown on the LaAlO 3 substrate. 67 So, next, we examine the effect of strain on the surface and surface segregation energies of the Ba/Co surface up to 4% compressive and tensile strains. In order to understand the propensity for surface cation segregation, two different surfaces were analyzed; one, with the cation (likely to migrate) present in the bulk layer of the structure, and the second, when it is at the top-most surface layer, Fig.…”