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We use inelastic neutron scattering to study the effect of an in-planemagnetic field on the magnetic resonance in optimally doped superconductorsFeSe$_{0.4}$Te$_{0.6}$ ($T_c=14$ K) and BaFe$_{1.9}$Ni$_{0.1}$As$_{2}$($T_c=20$ K). While the magnetic field up to 14.5 Tesla does not change theenergy of the resonance, it particially suppresses $T_c$ and the correspondingsuperconductivity-induced intensity gain of the mode. However, we find nodirect evidence for the field-induced spin-1 Zeeman splitting of the resonance.Therefore, it is still unclear if the resonance is the long-soughtsinglet-triplet excitation directly coupled to the superconducting electronCooper pairs.

physical review. b, condensed matter and materials physics

In-plane magnetic field effect on the neutron spin resonance in  optimally doped FeSe$_{0.4}$Te$_{0.6}$ and BaFe$_{1.9}$Ni$_{0.1}$As$_{2}$  superconductors