The effects of Co3O4 on the structure and unusual magnetism of LaCoO3

Journal of Physics. Condensed Matter : an Institute of Physics Journal
A M DurandC H Booth

Abstract

Bulk La(w)CoO(3) particles with w = 1.1, 1.0, 0.9, 0.8, and 0.7 were synthesized using starting materials with varying molar ratios of La(2)O(3) and Co(3)O(4). The resulting particles are characterized as LaCoO(3) crystals interfaced with a crystalline Co(3)O(4) phase. X-ray and neutron scattering data show little effect on the average structure and lattice parameters of the LaCoO(3) phase resulting from the Co(3)O(4) content, but magnetization data indicate that the amount of Co(3)O(4) strongly affects the ferromagnetic ordering at the interfaces below TC ≈ 89 K. In addition to ferromagnetic long-range order, LaCoO(3) exhibits antiferromagnetic behavior with an unusual temperature dependence. The magnetization for fields 20 Oe ⩽ H ⩽ 5 kOe is fit to a combination of a power law ((T - TC)/TC)(β) behavior representing the ferromagnetic long-range order and sigmoid-convoluted Curie-Weiss-like behavior representing the antiferromagnetic behavior. The critical exponent β = 0.63 ± 0.02 is consistent with 2D (surface) ordering. Increased Co(3)O(4) correlates well to increased ferromagnetism. The weakening of the antiferromagnetism below T ≈ 40 K is a consequence of the lattice reaching a critical rhombahedral distortion as T is decrea...Continue Reading

References

Apr 1, 1996·Physical Review. B, Condensed Matter·V GolovanovA R Moodenbaugh
Aug 15, 1996·Physical Review. B, Condensed Matter·M A KorotinG A Sawatzky
Oct 30, 2012·Physical Review Letters·S MedlingF Bridges
Aug 31, 2013·Journal of Physics. Condensed Matter : an Institute of Physics Journal·A M DurandM Bhat

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