Strain Control of Oxygen Vacancies in Epitaxial Strontium Cobaltite Films

Abstract

The ability to manipulate oxygen anion defects rather than metal cations in complex oxides can facilitate creating new functionalities critical for emerging energy and device technologies. However, the difficulty in activating oxygen at reduced temperatures hinders the deliberate control of important defects, oxygen vacancies. Here, strontium cobaltite (SrCoOx) is used to demonstrate that epitaxial strain is a powerful tool for manipulating the oxygen vacancy concentration even under highly oxidizing environments and at annealing temperatures as low as 300 C. By applying a small biaxial tensile strain (2%), the oxygen activation energy barrier decreases by ~30%, resulting in a tunable oxygen deficient steady-state under conditions that would normally fully oxidize unstrained cobaltite. These strain-induced changes in oxygen stoichiometry drive the cobaltite from a ferromagnetic metal towards an antiferromagnetic insulator. The ability to decouple the oxygen vacancy concentration from its typical dependence on the operational environment is useful for effectively designing oxides materials with a specific oxygen stoichiometry.

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Cited by in corpus (23)

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• Strain effects on oxygen vacancy formation energy in perovskites
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• Lattice effects on the formation of oxygen vacancies in perovskite thin films
• Stretching Epitaxial La0.6Sr0.4CoO3-δ for Fast Oxygen Reduction
• Role of oxygen vacancy in the spin-state change and magnetic ordering in SrCoO${}_{3-\delta }$
• Oxygen vacancies in strained SrTiO${}_3$ thin films: formation enthalpy and manipulation
• Room-temperature ferromagnetic insulating state in highly cation-ordered epitaxial oxide double perovskite
• Single-axis dependent structural and multiferroic properties of orthorhombic RMnO${}_3$ (R = Gd - Lu)
• Unconventional exchange bias coupling at perovskite/brownmillerite interface in spontaneously stabilized SrCoO3-δ/SrCoO2.5 bi-layer
• Dynamics of anisotropic oxygen-ion migration in strained cobaltites
• Atomic origin for hydrogenation promoted bulk oxygen vacancies removal in vanadium dioxide
• Structural, transport, optical and electronic properties of Sr${}_2$CoNbO${}_6$ thin films
• Reversible Thermal Strain Control of Oxygen Vacancy Ordering in an Epitaxial La${}_{0.5}$Sr${}_{0.5}$CoO${}_{3-\delta }$ Film
• Revisiting the zero-temperature phase diagram of stoichiometric SrCoO3 with first-principles methods
• Room temperature large spontaneous exchange bias in hard-soft antiferromagnetic composite BiFeO3-TbMnO3
• Electronic and magnetic properties of epitaxial SrRhO3 films
• Structural and transport properties of La${}_{1-x}$Sr${}_x$Co${}_{1-y}$Nb${}_y$O${}_3$ thin films
• The impact of the near-surface region on the interpretation of x-ray absorption spectroscopy
• First-principles based Monte Carlo modeling of oxygen deficient Fe-substituted SrTiO${}_3$ experimental magnetization
• Ab initio study of the strain dependence of thermopower in electron-doped SrTiO${}_3$
• Stabilization of the oxygen concentration in La${}_{0.3}$Sr${}_{0.7}$CoO${}_{3-\delta }$ thin films by LaAlO${}_3$ capping layer