Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2012-04-25
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 3 figures
Scientific paper
In addition to unconventional high-Tc superconductivity, the iron arsenides exhibit strong magnetoelastic coupling and a notable electronic anisotropy within the a-b plane. We relate these properties by studying underdoped Ba(Fe{1-x}Co{x})2As2 by x-ray diffraction in pulsed magnetic fields up to 27.5 Tesla. We exploit magnetic detwinning effects to demonstrate anisotropy in the in-plane susceptibility, which develops at the structural phase transition despite the absence of magnetic order. The degree of detwinning increases smoothly with decreasing temperature, and a single- domain condition is realized over a range of field and temperature. At low temperatures we observe an activated behavior, with a large hysteretic remnant effect. Detwinning was not observed within the superconducting phase for accessible magnetic fields.
Chu Jiun-Haw.
Das Rahul Kumar
Fisher Ian R.
Islam Zahirul
Kuo Hsueh-Hui
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