Persistent short-range stripe-type magnetic order in overdoped Ba(Fe<sub>1-x</sub>Cu<sub>x</sub>)<sub>2</sub>As<sub>2</sub> (0.145<=x<=0.553)
ORAL
Abstract
In the heavily Cu-doped regime where long-range stripe-type antiferromagnetic order in BaFe2As2 is suppressed, Ba(Fe1-xCux)2As2 (0.145≤x≤0.553) samples exhibit spin-glass-like behavior in magnetic susceptibility and insulating-like temperature dependence in electrical transport. Using elastic neutron scattering, we find stripe-type short-range magnetic order in the spin-glass region identified by susceptibility measurements. The persistent stripe order in Ba(Fe1-xCux)2As2 likely result from Cu acting effectively as vacancies, relieving magnetic frustration. The behaviors in Ba(Fe1-xCux)2As2 are compared with those in NaFe1-xCuxAs and Fe1-xCuxTe, suggesting a common tendency towards stripe-type magnetic order in these materials.
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Presenters
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Yu Song
- University of California Berkeley
- Univ of California - Berkeley