Magnetic excitations in double perovskite iridates La${}_2$$M$IrO${}_6$ ($M$ = Co, Ni, and Zn) mediated by 3$d$-5$d$ hybridization

Abstract

By performing resonant inelastic x-ray scattering (RIXS) measurements at the Ir $L_3$ edge, we have investigated the low-energy elementary excitations in a series of double perovskite iridate single crystals, La${}_2$$M$IrO${}_6$ ($M$ = Co, Ni, and Zn). Almost dispersionless magnetic excitations at $\sim$ 42(6) meV and $\sim$ 35(5) meV have been observed in crystals containing magnetic 3$d$ ions, La${}_2$CoIrO${}_6$ and La${}_2$NiIrO${}_6$, respectively. In contrast, this low-energy magnetic excitation is absent in La${}_2$ZnIrO${}_6$ in which the 3$d$ ions are non-magnetic, suggesting the importance of 3$d$-5$d$ hybridization in the magnetic properties of these double perovskite iridates. The magnetic excitation is suppressed completely above the magnetic ordering temperature, suggesting the inadequacy of using a simple spin Hamiltonian to describe magnetism of these materials.

8 pages, 4 figures, accepted for publication in Physical Review B

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• The 3d and 5d electronic structures and orbital hybridization in Ba- and Ca-doped La2CoIrO6 double perovskite
• Varying magnetism in the lattice distorted Y2NiIrO6 and La2NiIrO6
• Correlated proton disorder in the crystal structure of the double hydroxide perovskite CuSn(OH)${}_6$
• Disordered ground state in the three-dimensional face-centred frustrated spin-$\frac{5}{2}$ system MnSn(OH)${}_{\text{6}}$
• Outstanding TC Enhancement in 5d-3d Y2NiIrO6 by Compression