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Tensile-strain-dependent spin states in epitaxial LaCoO3 thin films:Professor Masashi Kawasaki, Professor Yoshinori Tokura, Department of Applied Physics, and other researchers.

The spin states of Co3+ ions in perovskite-type LaCoO3, 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 LaCoO3 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.

Physical Review Letters: