Spin anisotropy due to spin-orbit coupling in optimally hole-doped Ba0.67K0.33Fe2As2

Abstract : We use polarized inelastic neutron scattering to study the temperature and energy dependence of spin space anisotropies in the optimally-hole-doped iron pnictide Ba0.67K0.33Fe2As2 (T-c= 38 K). In the superconducting state, while the high-energy part of the magnetic spectrum is nearly isotropic, the low-energy part displays a pronounced anisotropy, manifested by a c-axis polarized resonance. We also observe that the spin anisotropy in superconducting Ba0.67K0.33Fe2As2 extends to higher energies compared with electron-doped BaFe2-xTMxAs2 (TM = Co, Ni) and isovalent-doped BaFe2As1.4P0.6, suggesting a connection between T-c and the energy scale of the spin anisotropy. In the normal state, the low-energy spin anisotropy for hole- and electron-doped iron pnictides near optimal superconductivity onset at temperatures similar to the temperatures at which the elastoresistance deviates from Curie Weiss behavior, pointing to a possible connection between the two phenomena. Our results highlight the relevance of the spin-orbit coupling to the superconductivity of the iron pnictides.
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Submitted on : Tuesday, July 31, 2018 - 12:06:00 PM
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Yu Song, Haoran Man, Rui Zhang, Xingye Lu, Chenglin Zhang, et al.. Spin anisotropy due to spin-orbit coupling in optimally hole-doped Ba0.67K0.33Fe2As2. Physical Review B : Condensed matter and materials physics, American Physical Society, 2016, 94 (21), pp.214516. ⟨10.1103/PhysRevB.94.214516⟩. ⟨cea-01851940⟩

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