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

Yu Song, Haoran Man, Rui Zhang, Xingye Lu, Chenglin Zhang, Meng Wang, Guotai Tan, L. P. Regnault, Yixi Su, Jian Kang, Rafael M. Fernandes, Pengcheng Dai

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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.

Original languageEnglish (US)
Article number214516
JournalPhysical Review B
Volume94
Issue number21
DOIs
StatePublished - Dec 23 2016

Bibliographical note

Funding Information:
The neutron work at Rice is supported by the U.S. NSF-DMR-1362219 and DMR-1436006 (P.D.). This work is also supported by the Robert A. Welch Foundation Grant No. C-1839 (P.D.). Work performed by R.M.F. and J.K. is supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under Award No. DE-SC0012336.

Publisher Copyright:
© 2016 American Physical Society.

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