Effect of uniaxial strain on the structural and magnetic phase transitions in BaFe2As2

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DOIResolve DOI: http://doi.org/10.1103/PhysRevLett.108.087001
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TypeArticle
Journal titlePhysical Review Letters
Volume108
Issue8
Pages087001-1087001-4
AbstractWe report neutron scattering experiments probing the influence of uniaxial strain on both the magnetic and structural order parameters in the parent iron pnictide compound, BaFe₂As₂. Our data show that modest strain fields along the in-plane orthorhombic b axis can affect significant changes in phase behavior simultaneous to the removal of structural twinning effects. As a result, we demonstrate in BaFe₂As₂ samples detwinned via uniaxial strain that the in-plane C₄ symmetry is broken by both the structural lattice distortion and long-range spin ordering at temperatures far above the nominal (strain-free) phase transition temperatures. Surprising changes in the magnetic order parameter of this system under relatively small strain fields also suggest the inherent presence of magnetic domains fluctuating above the strain-free ordering temperature in this material.
Publication date
LanguageEnglish
AffiliationNRC Canadian Neutron Beam Centre; National Research Council Canada
Peer reviewedYes
NPARC number20140154
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Record identifierceb8ba87-cf72-41c5-bd77-92873e4ec528
Record created2012-06-14
Record modified2016-05-09
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