TY  - JOUR
AU  - Song, Yu
AU  - Man, Haoran
AU  - Zhang, Rui
AU  - Lu, Xingye
AU  - Zhang, Chenglin
AU  - Wang, Meng
AU  - Tan, Guotai
AU  - Regnault, L.-P.
AU  - Su, Yixi
AU  - Kang, Jian
AU  - Fernandes, Rafael M.
AU  - Dai, Pengcheng
TI  - Spin anisotropy due to spin-orbit coupling in optimally hole-doped Ba $_{0.67}$ K $_{0.33}$ Fe $_{2}$ As $_{2}$
JO  - Physical review / B
VL  - 94
IS  - 21
SN  - 2469-9950
CY  - Woodbury, NY
PB  - Inst.
M1  - FZJ-2017-01820
SP  - 214516
PY  - 2016
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000390906100008
DO  - DOI:10.1103/PhysRevB.94.214516
UR  - https://juser.fz-juelich.de/record/827712
ER  -