Suppression of spin-state transition in epitaxially strained LaCoO_{3}

Details Suppression of spin-state transition in epitaxially strained LaCoO_{3} Suppression of spin-state transition in epitaxially strained LaCoO_{3}

2008-07-22

arxiv.org/abs/0807.3424v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures, submitted to Physical Review B

Scientific paper

10.1103/PhysRevB.78.174402

Epitaxial thin films of LaCoO_{3} (E-LCO) exhibit ferromagnetic order with a transition temperature T_c = 85 K, while polycrystalline thin LaCoO_{3} 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_{2,3} 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 K 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.

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