Fragmented charged domain wall below the tetragonal-orthorhombic phase transition in BaTiO3

Abstract

Ferroelectric charged domain walls are known for their high electrical conductivity, making them promising candidates for modern electronics. A remarkably high conductivity and nominal charge density has been found in the head-to-head ferroelastic domain wall of tetragonal barium titanate. Conductivity of this domain wall decreases by several orders of magnitude when the temperature drops down below about 5 °C when the tetragonal phase transforms to the orthorhombic one. We explored the evolution of these ferroelectric charged domain walls in BaTiO3 crystals, while they undergo this phase transition by in situ optical microscopy. Our results reveal that, below the phase transition, the domains adjacent to charge domain walls become twinned, and the head-to-head charged domain wall transforms into a superdomain wall, which is broken into alternating micrometer-scale segments with and without the excess bound charge. Since the macroscopic conductive channel along such fragmented superdomain wall is disrupted, these observations explain the observed loss of the domain wall conductivity below the phase transition.