Relationship between A-site cation and magnetic structure in 3d−5d−4f double perovskite iridates Ln2NiIrO

Magnetic structure of the double perovskite La2NiIrO6 investigated using neutron diffraction

“…The presence of an ordered magnetic moment on the Ir site was not conclusively answered in Ref. [36] as the determined value of 0.17(3) μ B was said to be at the detection limit of the measurement and a zero moment on the Ir site could not be excluded. Figure 7(b) demonstrates that ignoring the magnetic moment on the Ir site results in a poorer refinement of our high statistics data with differences clearly visible for several magnetic peaks and an increase in R Mag = 11.8 and χ 2 = 11.7.…”

“…8(b) corresponds to the solution presented in Ref. [36] if the component in the b direction is ignored. Using our data, this solution returns notably poorer agreement: R Mag = 9.4 and χ 2 = 7.6.…”

“…The Rietveld refinement of the data reveals various possible magnetic ground states in La 2 NiIrO 6 , which are indistinguishable by NPD. Recently, Ferreira et al [36], have presented a spin configuration for La 2 NiIrO 6 which, as shown by this work, represents only one of the possible solutions. The presence of an ordered iridium ordering at the same temperature as the Ni moment can now be ascertained.…”

“…The Ir-based double perovskites having a 3d metal at the B site have drawn special attention due to their interesting properties originating from the interplay of the 3d ion having strong electron correlation with the Ir ion where SOC plays a major role in deciding the physical and chemical properties [29][30][31][32][33][34][35][36]. In Ir-based double perovskites having IrO 6 octahedra, the Ir 5d levels split into e g and t 2g levels under the octahedral crystal electric field (CEF).…”

Magnetic excitations in the double-perovskite iridates La2MIrO6 (M=Co,Ni,andZnJin1, Chun2, Kim3 et al. 2022Phys. Rev. B4000View full textAdd to dashboardCite

“…In addition, La 2 NiIrO 6 (LNIO) was recently determined to be a noncollinear antiferromagnet with k = (1/2, 1/2, 0), showing only the a-and c-spin components with simultaneous ordering of Ni 2+ and Ir 4+ moments. 33 Although many experimental studies have been car-arXiv:2202.04803v1 [cond-mat.str-el] 10 Feb 2022 ried out to understand the static magnetic order in the DP iridates La 2 M IrO 6 , information about the spin dynamics have been scarce. For LZIO, a recent inelastic neutron scattering study found gapped spin-wave excitations with very weak dispersion, suggesting strong exchange anisotropies and a possible dominant Kitaev interaction associated with the monoclinically distorted DP lattice.…”