The unusual magnetism of nanoparticle LaCoO3

Durand, A. M.; Belanger, D. P.; Hamil, T. J.; Ye, F.; Chi, S.; Fernandez-Baca, J. A.; Booth, C. H.; Abdollahian, Y.; Bhat, M.

doi:10.1088/0953-8984/27/17/176003

Title: The unusual magnetism of nanoparticle LaCoO₃

Journal Article · Wed Apr 15 00:00:00 EDT 2015 · Journal of Physics. Condensed Matter

DOI:https://doi.org/10.1088/0953-8984/27/17/176003· OSTI ID:1265484

Durand, A. M. ^[1]; Belanger, D. P. ^[1]; Hamil, T. J. ^[1]; Ye, F. ^[2]; Chi, S. ^[2]; Fernandez-Baca, J. A. ^[3]; Booth, C. H. ^[4]; Abdollahian, Y. ^[5]; Bhat, M. ^[6]

Univ. of California, Santa Cruz, CA (United States). Dept. of Physics
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division
Univ. of California, Santa Cruz, CA (United States). Dept. of Chemistry
Castilleja School, Palo Alto, CA (United States)

Bulk and nanoparticle powders of LaCoO3(LCO) were synthesized and their magnetic and structural properties were studied using SQUID magnetometry and neutron diffraction. The bulk and large nanoparticles exhibit weak ferromagnetism (FM) below T ≈ 85 K and a crossover from strong to weak antiferromagnetic (AFM) correlations near a transition expressed in the lattice parameters, To≈ 40 K. This crossover does not occur in the smallest nanoparticles; instead, the magnetic behavior is predominantly ferromagnetic. The amount of FM in the nanoparticles depends on the amount of Co3O4impurity phase, which induces tensile strain on the LCO lattice. A core-interface model is introduced, with the core region exhibiting the AFM crossover and with FM in the interface region near surfaces and impurity phases.

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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)

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

OSTI ID:: 1265484

Alternate ID(s):: OSTI ID: 1512189

Journal Information:: Journal of Physics. Condensed Matter, Vol. 27, Issue 17; ISSN 0953-8984

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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