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Electronic energy band structure of the double perovskite Ba2MnWO6
Yukari Fujioka1, Johannes Frantti, Risto M Nieminen
1Laboratory of Physics, Helsinki University of Technology, Post Office Box 1100, FI-02015 HUT, Espoo, Finland. yukari.fujioka@hut.fi
Abstract:
The electronic and magnetic structures of the double perovskite oxide Ba 2MnWO6 (BMW) were determined by employing the density functional theory within the generalized gradient approximation (GGA) + U approach. BMW is considered a prototype double perovskite due to its high degree of B-site ordering and is a good case study for making a comparison between computations and experiments. By adjusting the U-parameter, the electronic energy band structure and magnetic properties, which were consistent with the experimental results, were obtained. These computations revealed that the valence bands are mainly formed from Mn 3d and O 2p states, while the conduction bands are derived from W 5d and O 2p states. The localized bands composed from Mn 3d states are located in the bandgap. The results imply that the formation of polarons in the conduction band initiate the resonance Raman modes observed as a series of equidistant peaks.
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