Evidence for an electron nematic phase transition in underdoped iron pnictide superconductors
Abstract
Electrical resistivity measurements of detwinned single crystals of the representative iron arsenide Ba(Fe1-xCox)2As2 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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