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Energetics and magnetic properties of V-doped MgO bulk and (001) surface: A GGA, GGA plus U, and hybrid density functional study
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
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2010 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 82, no 13, 134406- p.Article in journal (Refereed) Published
Abstract [en]

In this work, a first-principles study of the energetic and magnetic properties of V-doped MgO is presented, where both the bulk and (001) surface were investigated. It is found that V assumes a high-spin state with a local moment of about 3 mu(B). In the bulk, the interaction between these local moments is very short ranged and the antiferromagnetic (AFM) ordering is energetically more favorable. The formation of V-V-Mg-V defect clusters is found to weaken the antiferromagnetic coupling in bulk MgO, degenerating the AFM and ferro-magnetic state. However, these clusters are high in energy and will not form at equilibrium conditions. By employing the GGA+U approach, with U=5 eV, the V 3d states on the (001) surface are shifted below the Fermi level, and a reasonable surface geometry was achieved. A calculation with the hybrid HSE03 functional, contradicts the GGA+U results, indicating that the V-MgO surface should be metallic at this concentration. From the energetics it is concluded that, at the modeled concentration, VxOy phases will limit the solubility of V in MgO at equilibrium conditions, which is in agreement with previous experimental findings. In order to achieve higher concentrations of V, an off-equilibrium synthesis method is needed. Finally, we find that the formation energy of V at the surface is considerably higher than in the bulk and V is thus expected to diffuse from the surface into the bulk of MgO.

Place, publisher, year, edition, pages
2010. Vol. 82, no 13, 134406- p.
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Physical Sciences
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URN: urn:nbn:se:uu:diva-133586DOI: 10.1103/PhysRevB.82.134406ISI: 000282506700012OAI: oai:DiVA.org:uu-133586DiVA: diva2:370240
Available from: 2010-11-16 Created: 2010-11-11 Last updated: 2017-12-12Bibliographically approved

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Johansson, BörjeAhuja, Rajeev

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