A new material for probing spin-orbit coupling in Iridates

Abstract

We report the structure and magnetic properties of a new iridate compound, SrxLa11-xIr4O24, where the d-electron count of Ir and therefore its number of unpaired electrons can be tuned continuously from 5d5 Ir4+ to 5d4 Ir5+, i.e. from SrLa10Ir4O24 to Sr5La6Ir4O24. The IrO6 octahedra in SrxLa11-xIr4O24 are isolated from each other and from other transition elements, minimizing band effects, and the doping is on the framework sites, not the Ir sites, minimizing the effects of disorder. Measurements of the temperature dependent magnetic susceptibility are employed to determine the evolution of the Ir magnetic moment on progressing from 5d5 Ir4+ to 5d4 Ir5+, and are clearly best described by a transition from a J=1/2 to a J=0 Ir magnetic state; that is, the evolution of the magnetic susceptibility shows the dominance of spin-orbit coupling in determining the magnetic properties of a material with highly isolated IrO6 octahedra.

Accepted Physical Review

References in corpus (19)

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Cited by in corpus (9)

• Spin-Orbit Physics Giving Rise to Novel Phases in Correlated Systems: Iridates and Related Materials
• Hexagonal Perovskites as Quantum Materials
• Coulomb Correlations in 4d and 5d Oxides from First Principles - or How Spin-Orbit Materials choose their Effective Orbital Degeneracies
• New Honeycomb Iridium (V) Oxides: NaIrO${}_3$ and Sr${}_3$CaIr${}_2$O${}_9$
• Influence of structural distortions on the Ir magnetism in Ba2-xSrxYIrO6 double perovskites
• The trimer-based spin liquid candidate Ba4NbIr3O12
• Possible quantum paramagnetism in compressed Sr${}_2$IrO${}_4$
• Sr${}_3$Ir${}_2$O${}_7$F${}_2$: Topochemical conversion of a relativistic Mott state into a spin-orbit driven band insulator
• Implications of electron and hole doping on the magnetic properties of spin-orbit entangled Ca${}_{\text{4}}$IrO${}_{\text{6}}$ from DFT calculations