%0 Journal Article %K Electric fields %K Density functional theory %K Domain walls %K Ferroelectric materials %K Ferroelectricity %K Degrees of freedom (mechanics) %K Metal insulator transition %K Transition metals %K Transition metal compounds %K Domain wall orientations %K Environmental friendliness %K External electric field %K Insulator metal transition %K Phenomenological theory %K Strong electronic correlations %K Tail-to-tail domain walls %K Transition-metal oxides %A D Meier %A J Seidel %A A Cano %A K Delaney %A Y Kumagai %A M Mostovoy %A N.A Spaldin %A Ramamoorthy Ramesh %A M Fiebig %B Nature Materials %D 2012 %G eng %I Nature Publishing Group %P 284-288 %R 10.1038/nmat3249 %T Anisotropic conductance at improper ferroelectric domain walls %V 11