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Evidence for an electron nematic phase transition in underdoped iron pnictide superconductors

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arxiv 1002.3364 v2 pith:ZMVQ6Q3C submitted 2010-02-17 cond-mat.supr-con

Evidence for an electron nematic phase transition in underdoped iron pnictide superconductors

Jiun-Haw Chu , James G. Analytis , Kristiaan De Greve , Peter L. McMahon , Zahirul Islam , Yoshihisa Yamamoto , Ian R. Fisher This is my paper
classification cond-mat.supr-con
keywords transitionironstructuralanisotropyantiferromagneticarsenideassociatedcompounds
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Electrical resistivity measurements of detwinned single crystals of the representative iron arsenide Ba(Fe$_{1-x}$Co$_x$)$_2$As$_2$ reveal a dramatic in-plane anisotropy associated with the tetragonal-to-orthorhombic structural transition that precedes the onset of long-range antiferromagnetic order. These results indicate that the structural transition in this family of compounds is fundamentally electronic in origin.

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