Inelastic neutron scattering measurements were performed to study the excitation spectra of a quadrupolar ordering compound YbSb. We observed the three peaks (12.5, 17 and 21 meV) around Γ6 - Γ8 excitations far above the quadrupolar ordering temperature (TQ). This result suggests that the magnetic excitations have a dispersion rather than the splitting of Γ8 states at high temperatures. We also observed the strong q dependence in q scans at energy = 1 meV above TQ. The observed q dependence above TQ suggests that the theoretical approach beyond the molecular field approximation is required in order to understand the magnetic properties of Yb monopnictides.
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