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Condensed Matter > Superconductivity

Title: Dichotomy between in-plane magnetic susceptibility and resistivity anisotropies in extremely strained $BaFe_{2}As_{2}$

Abstract: The in-plane resistivity and uniform magnetic susceptibility anisotropies of $BaFe_{2}As_{2}$ are obtained with a new method, in which a large symmetry-breaking uniaxial strain is applied using a substrate with a very anisotropic thermal expansion. The resistivity anisotropy and its corresponding elastoresistivity exhibit very similar diverging behavior as those obtained from piezo-stack experiments. This suggests that the resistivity anisotropy is more a direct measure of magnetism than of nematicity, since the nematic transition is no longer well-defined under a large strain. In strong contrast to the large resistivity anisotropy above $T_{N}$, the anisotropy of the in-plane magnetic susceptibility develops largely below $T_{N}$. Using an itinerant model, we show that the observed anisotropy ($\chi_{b}>\chi_{a}$) is determined by spin-orbit coupling and the orientation of the magnetic moments in the antiferromagnetic phase, and that the anisotropy is dominated by intra-orbital ($yz,yz$) contributions of the Umklapp susceptibility.
Comments: 6 pages and supplemental material
Subjects: Superconductivity (cond-mat.supr-con)
Journal reference: Nature Communications 8:504 2017
DOI: 10.1038/s41467-017-00712-3
Cite as: arXiv:1610.05575 [cond-mat.supr-con]
  (or arXiv:1610.05575v2 [cond-mat.supr-con] for this version)

Submission history

From: Christoph Meingast [view email]
[v1] Tue, 18 Oct 2016 12:44:30 GMT (2476kb,D)
[v2] Wed, 19 Oct 2016 13:43:23 GMT (2509kb,D)