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

Abstract

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.

5 pages, 5 figures, submitted to Physical Review B

References in corpus (6)

• The spin state transition in LaCoO${}_3$; revising a revision
• Structural phenomena associated with the spin-state transition in LaCoO3
• Evidence for a Low-Spin to Intermediate-Spin State Transition in LaCoO3
• Evidence for orbital ordering in LaCoO3
• The 5D term origin of the excited triplet in LaCoO3
• Itinerant metamagnetism and possible spin transition in LaCoO${}_3$ by temperature/hole doping

Cited by in corpus (9)

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• Soft x-ray magnetic circular dichroism of LaCoO${}_3$, La${}_{0.7}$Ce${}_{0.3}$CoO${}_3$, and La${}_{0.7}$Sr${}_{0.3}$CoO${}_3$ films: Evidence for Co valency-dependent magnetism and magnetic anisotropy
• Structural effects on the spin-state transition in epitaxially strained LaCoO${}_3$ films
• Ferromagnetic insulating state in tensile-strained LaCoO${}_3$ thin films
• Spin state transition in LaCoO3 by variational cluster approximation
• First-principles study of intermediate-spin ferrous iron in the Earth's lower mantle
• Exploiting symmetry-mismatch to control magnetism in a ferroelastic heterostructure
• Strain-induced atomic-scale building blocks for ferromagnetism in epitaxial LaCoO3
• Tunable Ferromagnetism in LaCoO3 Epitaxial Thin Films