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URN: urn:nbn:de:swb:90-753688

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

He, Mingquan; Wang, Liran; Ahn, Felix; Hardy, Frédéric; Wolf, Thomas; Adelmann, Peter; Schmalian, Jörg; Eremin, Ilya; Meingast, Christoph

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 TN, the anisotropy of the in-plane magnetic susceptibility develops largely below TN. Our results imply that lattice and orbital degrees of freedom play a subdominant role in these materials.


Zugehörige Institution(en) am KIT Institut für Festkörperphysik (IFP)
Institut für Theorie der Kondensierten Materie (TKM)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator ISSN: 2041-1723
URN: urn:nbn:de:swb:90-753688
KITopen ID: 1000075368
Erschienen in Nature Communications
Band 8
Heft 1
Seiten 504
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Schlagworte Magnetic properties and materials; Superconducting properties and materials
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