Magnonlike dispersion of spin resonance in Ni-doped BaFe${}_2$As${}_2$

Abstract

Inelastic neutron scattering measurements on Ba(Fe${}_{0.963}$Ni${}_{0.037}$)${}_2$As${}_2$ manifest a neutron spin resonance in the superconducting state with anisotropic dispersion within the Fe layer. Whereas the resonance is sharply peaked at Q${}_{AFM}$ along the orthorhombic a axis, the resonance disperses upwards away from Q${}_{AFM}$ along the b axis. In contrast to the downward dispersing resonance and hour-glass shape of the spin excitations in superconducting cuprates, the resonance in electron-doped BaFe${}_2$As${}_2$ compounds possesses a magnon-like upwards dispersion.

5 pages and 3 figures + supplement(3pages and 1 figure)

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