Electronic and magnetic structure of the mixed-valence cobaltite CaBaCo4O7

Chatterjee, S. ; Saha-Dasgupta, T. (2011) Electronic and magnetic structure of the mixed-valence cobaltite CaBaCo4O7 Physical Review B: Condensed Matter and Materials Physics, 84 (8). 085116_1-085116_6. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v84/i8/e085116

Related URL: http://dx.doi.org/10.1103/PhysRevB.84.085116

Abstract

Using first-principles density functional calculations we study the electronic and magnetic structure of mixed-valent cobaltite, CaBaCo4O7, consisting of alternate stacking of kagome and triangular layers. The compound belongs to the "114" series with the general formula, LnBaM4O7 (M= Co, Fe). Our calculation shows that the strong orthorhombic distortion of the structure weakens the geometrical frustration and establishes the ferrimagnetic order, in good agreement with that reported by Caignaertet al. [ Phys. Rev. B 81 094417 (2010)]. Our calculated magnetic exchanges show strong Co-O-Co interactions both within the kagome layer and that connecting kagome with the triangular layer, thereby establishing the observed three-dimensional ordering. The reported magnetic ordering temperature is found to be smaller than that expected from the calculated magnetic exchanges, indicating the frustration being operative.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:65062
Deposited On:15 Oct 2011 12:03
Last Modified:15 Oct 2011 12:03

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