paper

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

arXiv:2202.04803 · doi:10.1103/PhysRevB.105.054419

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

Magnetic excitations in double perovskite iridates La2​MIrO6​ (M = Co, Ni, and Zn) mediated by 3d-5d hybridization

Abstract

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