Spin State Disproportionation in Insulating Ferromagnetic LaCoO₃ Epitaxial Thin Films.

ABSTRACT: The origin of insulating ferromagnetism in epitaxial LaCoO₃ films under tensile strain remains elusive despite extensive research efforts are devoted. Surprisingly, the spin state of its Co ions, the main parameter of its ferromagnetism, is still to be determined. Here, the spin state in epitaxial LaCoO₃ thin films is systematically investigated to clarify the mechanism of strain-induced ferromagnetism using element-specific X-ray absorption spectroscopy and dichroism. Combining with the configuration interaction cluster calculations, it is unambiguously demonstrated that Co³⁺ in LaCoO₃ films under compressive strain (on LaAlO₃ substrate) is practically a low-spin state, whereas Co³⁺ in LaCoO₃ films under tensile

SUBMITTER: Chen S 

PROVIDER: S-EPMC10520649 | biostudies-literature | 2023 Sep

REPOSITORIES: biostudies-literature