Tensile-Strain Dependent Spin States in Epitaxial LaCoO${}_3$ Thin Films

Abstract

The spin states of Co${}^{3+}$ ions in perovskite-type LaCoO${}_3$, governed by complex interplay between the electron-lattice interactions and the strong electron correlations, still remain controversial due to the lack of experimental techniques which can detect directly. In this letter, we revealed the tensile-strain dependence of spin states, $i.e.$ the ratio of the high- and low-spin states, in epitaxial thin films and a bulk crystal of LaCoO${}_3$ via resonant inelastic soft x-ray scattering. The tensile-strain as small as 1.0% was found to realize different spin states from that in the bulk.

arXiv comment5 pages, 4 figures

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• Structural and transport properties of La${}_{1-x}$Sr${}_x$Co${}_{1-y}$Nb${}_y$O${}_3$ thin films
• Photo-induced Antiferromagnetic-ferromagnetic Transition and Electronic Structure Modulation in GdBaCo${}_2$O${}_{5.5}$ Thin Film
• Effects of magnetic fields and orbital angular momentum on excitonic condensation in two-orbital Hubbard model
• Ferromagnetic half-metallicity in YBaCo2O6 and spin-states driven metal-insulator transition
• Evolution of valence-specific spin states and local distortions in La${}_{2-x}$Sr${}_x$CoO${}_4$
• Interplay of Quantum Size Effect and Tensile Strain on Surface Morphology of Sn(100) Islands