In-plane electronic anisotropy in underdoped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ revealed by detwinning in a magnetic field

Abstract

We present results of angle-dependent magnetoresistance measurements and direct optical images of underdoped Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ which reveal partial detwinning by action of a 14T magnetic field. Driven by a substantial magneto-elastic coupling, this result provides evidence for an electronic origin of the lattice distortion in underdoped iron pnictides. The observed anisotropy in these partially detwinned samples implies a substantial in-plane electronic anisotropy in the broken symmetry state, with a smaller resistivity along the antiferromagnetic ordering direction.

5 pages, 5 figures

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