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| Hauptseite > Publikationsdatenbank > Spin anisotropy due to spin-orbit coupling in optimally hole-doped Ba $_{0.67}$ K $_{0.33}$ Fe $_{2}$ As $_{2}$ |
| Hauptseite > Publikationsdatenbank > Spin anisotropy due to spin-orbit coupling in optimally hole-doped Ba $_{0.67}$ K $_{0.33}$ Fe $_{2}$ As $_{2}$ |
| Journal Article | FZJ-2017-01820 |
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2016
Inst.
Woodbury, NY
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Please use a persistent id in citations: http://hdl.handle.net/2128/13861 doi:10.1103/PhysRevB.94.214516
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 (Tc=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 Tc 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.
Keyword(s): Magnetic Materials (1st) ; Condensed Matter Physics (2nd) ; Magnetism (2nd)
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