Suppression of spin-state transition in epitaxially strained LaCoO3

Article

关键词: X-RAY-ABSORPTION;    ELECTRONIC-STRUCTURE;    BRANCHING RATIO;   

DOI  :  10.1103/PhysRevB.78.174402

来源: SCIE

【 摘 要 】

Epitaxial thin films of LaCoO3 (e-LCO) exhibit ferromagnetic order with a transition temperature T-C=85 K while polycrystalline thin LaCoO3 films (p-LCO) remain paramagnetic. The temperature-dependent spin-state structure for both e-LCO and p-LCO was studied by x-ray absorption spectroscopy at the Co L-2,L-3 and O K edges. Considerable spectral redistributions over temperature are observed for p-LCO. The spectra for e-LCO, on the other hand, do not show any significant changes for temperatures between 30 and 450 K at both edges, indicating that the spin state remains constant and that the epitaxial strain inhibits any population of the low-spin (S=0) state with decreasing temperature. This observation identifies an important prerequisite for ferromagnetism in e-LCO thin films.

【 授权许可】

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