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

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

2010-02-17

arxiv.org/abs/1002.3364v2

Science 329, 824 (2010)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

10.1126/science.1190482

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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