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

He, Mingquan 1; Wang, Liran 1; Ahn, Felix; Hardy, Frédéric 1; Wolf, Thomas 1; Adelmann, Peter 1; Schmalian, Jörg 1,2; Eremin, Ilya; Meingast, Christoph 1
1 Institut für Festkörperphysik (IFP), Karlsruher Institut für Technologie (KIT)
2 Institut für Theorie der Kondensierten Materie (TKM), Karlsruher Institut für Technologie (KIT)


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.

Volltext §
DOI: 10.5445/IR/1000075368
DOI: 10.1038/s41467-017-00712-3
Zitationen: 32
Web of Science
Zitationen: 41
Zitationen: 35
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Festkörperphysik (IFP)
Institut für Theorie der Kondensierten Materie (TKM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2017
Sprache Englisch
Identifikator ISSN: 2041-1723
KITopen-ID: 1000075368
HGF-Programm 43.21.01 (POF III, LK 01) Quantum Correlations in Condensed Matter
Erschienen in Nature Communications
Verlag Nature Research
Band 8
Heft 1
Seiten 504
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Schlagwörter Magnetic properties and materials; Superconducting properties and materials
Nachgewiesen in Web of Science
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