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

Durand, Alice M.; Hamil, T. J.; Belanger, David P.; Chi, Songxue; Ye, Feng; Fernandez-Baca, Jaime A.; Abdollahian, Y.; Booth, C. H.

doi:10.1088/0953-8984/27/12/126001

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

Journal Article · 09 March 2015 · Journal of Physics. Condensed Matter

DOI: https://doi.org/10.1088/0953-8984/27/12/126001 · OSTI ID:1896973

Durand, Alice M. ^[1]; Hamil, T. J. ^[1]; Belanger, David P. ^[1];

^[2];

^[3]; Abdollahian, Y. ^[1]; Booth, C. H. ^[4]

Univ. of California, Santa Cruz, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

In this work, bulk La_wCoO₃ particles with w = 1.1, 1.0, 0.9, 0.8, and 0.7 were synthesized using starting materials with varying molar ratios of La₂O₃ and Co₃O₄. The resulting particles are characterized as LaCoO3 crystals interfaced with a crystalline Co₃O₄ phase. X-ray and neutron scattering data show little effect on the average structure and lattice parameters of the LaCoO₃ phase resulting from the Co₃O₄ content, but magnetization data indicate that the amount of Co3O4 strongly affects the ferromagnetic ordering at the interfaces below $$T_C$$ ≈ 89 K. In addition to ferromagnetic long-range order, LaCoO₃ 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 $$((T – T_C)/T_C)^β$$ behavior representing the ferromagnetic long-range order and sigmoid-convoluted Curie–Weiss-like behavior representing the antiferromagnetic behavior. The critical exponent $$\textit{β}$$ = 0.63 ± 0.02 is consistent with 2D (surface) ordering. Increased Co₃O₄ correlates well to increased ferromagnetism. The weakening of the antiferromagnetism below $$\textit{T}$$ ≈ 40 K is a consequence of the lattice reaching a critical rhombahedral distortion as $$\textit{T}$$ is decreased for core regions far from the Co₃O₄ interfaces. We introduce a model that describes the ferromagnetic behavior of the interface regions and the unusual antiferromagnetism of the core regions.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; AC02-05CH11231; DMR-1126845

OSTI ID:: 1896973

Alternate ID(s):: OSTI ID: 1512182

Journal Information:: Journal of Physics. Condensed Matter, Vol. 27, Issue 12; ISSN 0953-8984

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 13 works

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