Lattice structure and magnetization of LaCoO3 thin films

Details Lattice structure and magnetization of LaCoO3 thin films Lattice structure and magnetization of LaCoO3 thin films

2010-02-25

arxiv.org/abs/1002.4726v1

Eur. Phys. J. B 76, 215219 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

submitted tu European Phys. J. B

Scientific paper

We investigate the structure and magnetic properties of thin films of the LaCoO$_{3}$ compound. Thin films are deposited by pulsed laser deposition on various substrates in order to tune the strain from compressive to tensile. Single-phase (001) oriented LaCoO$_{3}$ layers were grown on all substrates despite large misfits. The tetragonal distortion of the films covers a wide range from -2% to 2.8%. Our LaCoO$_{3}$ films are ferromagnetic with Curie temperature around 85 K, contrary to the bulk. The total magnetic moment is below $1\mu_{B}$/Co$^{3+}$, a value relatively small for an exited spin-state of the Co$^{3+}$ ions, but comparable to values reported in literature. A correlation of strain states and magnetic moment of Co$^{3+}$ ions in LaCoO$_{3}$ thin films is observed.

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