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In-plane electronic anisotropy in underdoped Ba(Fe_(1-x)Co_x)₂As₂ revealed by detwinning in a magnetic field

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arxiv 0911.3878 v1 pith:CKJO634F submitted 2009-11-19 cond-mat.supr-con

In-plane electronic anisotropy in underdoped Ba(Fe_(1-x)Co_x)₂As₂ revealed by detwinning in a magnetic field

Jiun-Haw Chu , James G. Analytis , David Press , Kristiaan De Greve , Thaddeus D. Ladd , Yoshihisa Yamamoto , Ian R. Fisher This is my paper
classification cond-mat.supr-con
keywords anisotropyelectronicunderdopeddetwinningfieldin-planemagneticsubstantial
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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.

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