Dichotomy between in-plane magnetic susceptibility and resistivity anisotropies in extremely strained BaFe2As2

Mingquan He, Liran Wang, Felix Ahn, Frédéric Hardy, Thomas Wolf, Peter Adelmann, Jörg Schmalian, Ilya Eremin and Christoph Meingast ()
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Mingquan He: Karlsruhe Institute of Technology
Liran Wang: Karlsruhe Institute of Technology
Felix Ahn: Ruhr-Universität Bochum
Frédéric Hardy: Karlsruhe Institute of Technology
Thomas Wolf: Karlsruhe Institute of Technology
Peter Adelmann: Karlsruhe Institute of Technology
Jörg Schmalian: Karlsruhe Institute of Technology
Ilya Eremin: Ruhr-Universität Bochum
Christoph Meingast: Karlsruhe Institute of Technology

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract High-temperature superconductivity in the Fe-based materials emerges when the antiferromagnetism of the parent compounds is suppressed by either doping or pressure. Closely connected to the antiferromagnetic state are entangled orbital, lattice, and nematic degrees of freedom, and one of the major goals in this field has been to determine the hierarchy of these interactions. Here we present the direct measurements and the calculations of the in-plane uniform magnetic susceptibility anisotropy of BaFe2As2, which help in determining the above hierarchy. The magnetization measurements are made possible by utilizing a simple method for applying a large symmetry-breaking strain, based on differential thermal expansion. In strong contrast to the large resistivity anisotropy above the antiferromagnetic transition at T N, the anisotropy of the in-plane magnetic susceptibility develops largely below T N. Our results imply that lattice and orbital degrees of freedom play a subdominant role in these materials.

Date: 2017
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DOI: 10.1038/s41467-017-00712-3

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