The beta Phase of Multiferroic Bismuth Ferrite and its beta-gamma Metal-Insulator Transition

Details The beta Phase of Multiferroic Bismuth Ferrite and its beta-gamma Metal-Insulator Transition The beta Phase of Multiferroic Bismuth Ferrite and its beta-gamma Metal-Insulator Transition

2007-05-20

arxiv.org/abs/0705.2883v3

Physical Review B, 77, 014110 (2008)

Physics

Condensed Matter

Materials Science

5 Pages, 5 grphs

Scientific paper

10.1103/PhysRevB.77.014110

We show that epitaxial (001) thin films of multiferroic bismuth ferrite BiFeO3 are monoclinic at room temperature instead of tetragonal or Rhombohedral as reported earlier . We report a orthorhombic order-disorder beta-phase between 820C and 950C contrary to the earlier report. The transition sequence monoclinic-orthorhombic phase in (001)BiFeO3 thin film (rhombohedral-orthorhombic transition in single crystal) resembles that of BaTiO3 or PbSc1/2Ta1/2O3. The transition to the cubic $\gamma$-phase causes an abrupt collapse of the bandgap toward zero (insulator-metal transition) at the orthorhombic-cubic beta-gamma transition around 950C. This transition is similar to the metal-insulator transition in Ba0.6K0.4BiO3.

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