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By performing resonant inelastic x-ray scattering (RIXS) measurements at theIr $\mathit{L_{\mathrm{3}}}$ edge, we have investigated the low-energyelementary excitations in a series of double perovskite iridate singlecrystals, La$_{2}$$\mathit{M}$IrO$_{6}$ ($\mathit{M}$ = Co, Ni, and Zn). Almostdispersionless magnetic excitations at $\sim$ 42(6) meV and $\sim$ 35(5) meVhave been observed in crystals containing magnetic 3$\mathit{d}$ ions,La$_{2}$CoIrO$_{6}$ and La$_{2}$NiIrO$_{6}$, respectively. In contrast, thislow-energy magnetic excitation is absent in La$_{2}$ZnIrO$_{6}$ in which the3$\mathit{d}$ ions are non-magnetic, suggesting the importance of3$\mathit{d}$-5$\mathit{d}$ hybridization in the magnetic properties of thesedouble perovskite iridates. The magnetic excitation is suppressed completelyabove the magnetic ordering temperature, suggesting the inadequacy of using asimple spin Hamiltonian to describe magnetism of these materials.

physical review. b./physical review. b

Magnetic excitations in double perovskite iridates  La$_{2}$$\mathit{M}$IrO$_{6}$ ($\mathit{M}$ = Co, Ni, and Zn) mediated by  3$\mathit{d}$-5$\mathit{d}$ hybridization