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Electronic states and magnetic structure at the Co O (110) surface: A first-principles study

Author(s): Chen, Jia; Selloni, Annabella

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Abstract: Tricobalt tetraoxide (Co3O4) is an important catalyst and Co3O4(110) is a frequently exposed surface in Co3O4 nanomaterials. We employed density-functional theory with the on-site Coulomb repulsion U term to study the atomic structures, energetics, and magnetic and electronic properties of the two possible terminations, A and B, of this surface. These calculations predict A as the stable termination in a wide range of oxygen chemical potentials, consistent with recent experimental observations. The Co3+ ions do not have a magnetic moment in the bulk, but become magnetic at the surface, which leads to surface magnetic orderings different from that in the bulk. Surface electronic states are present in the lower half of the bulk band gap and cause partial metallization of both surface terminations. These states are responsible for the charge compensation mechanism stabilizing both polar terminations. The computed critical thickness for polarity compensation is four layers.
Publication Date: 13-Feb-2012
Citation: Chen, Jia, Selloni, Annabella. (2012). Electronic states and magnetic structure at the Co O (110) surface: A first-principles study. Physical Review B, 85 (8), 10.1103/PhysRevB.85.085306
DOI: doi:10.1103/PhysRevB.85.085306
ISSN: 1098-0121
EISSN: 1550-235X
Pages: 85, 085306-1 - 085306-9
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review B
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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