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We use neutron polarization analysis to study spin excitation anisotropy inthe optimal-isovalent-doped superconductor BaFe2(As0.7P0.3)2 (Tc = 30 K).Different from optimally hole and electron-doped BaFe2As2, where there is aclear spin excitation anisotropy in the paramagnetic tetragonal state wellabove Tc, we find no spin excitation anisotropy for energies above 2 meV in thenormal state of BaFe2(As0.7P0.3)2. Upon entering the superconducting state,significant spin excitation anisotropy develops at the antiferromagnetic (AF)zone center QAF = (1, 0, L = odd), while magnetic spectrum is isotropy at thezone boundary Q = (1, 0, L = even). By comparing temperature, wave vector, andpolarization dependence of the spin excitation anisotropy in BaFe2(As0.7P0.3)2and hole-doped Ba0.67K0.33Fe2As2 (Tc = 38 K), we conclude that such anisotropyarises from spin-orbit coupling and is associated with the nearby AF order andsuperconductivity.

Spin excitation anisotropy in optimal-isovalent-doped superconductor BaFe2(As0.7P0.3)2