New Honeycomb Iridium (V) Oxides: NaIrO${}_3$ and Sr${}_3$CaIr${}_2$O${}_9$

Abstract

We report the structures and physical properties of two new iridates, NaIrO${}_3$ and Sr${}_3$CaIr${}_2$O${}_9$, both of which contain continuous two-dimensional honeycomb connectivity. NaIrO3 is produced by room temperature oxidative deintercalation of sodium from Na${}_2$IrO${}_3$, and contains edge-sharing IrO6 octahedra that form a planar honeycomb lattice. Sr${}_3$CaIr${}_2$O${}_9$, produced via conventional solid-state synthesis, hosts a buckled honeycomb lattice with novel corner-sharing connectivity between IrO6 octahedra. Both of these new compounds are comprised of Ir${}^{5+}$ (5$d^4$) and exhibit negligible magnetic susceptibility. They are thus platforms to investigate the origin of the nonmagnetic behavior exhibited by Ir${}^{5+}$ oxides, and provide the first examples of a $J$ = 0 state on a honeycomb lattice.

16 pages, 6 figures

References in corpus (18)

• Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models
• $\alpha$-RuCl3: a Spin-Orbit Assisted Mott Insulator on a Honeycomb Lattice
• Quantum spin Hall effect in a transition metal oxide Na2IrO3
• A new spin-anisotropic harmonic honeycomb iridate
• Crystal field splitting and correlation effect on the electronic structure of A2IrO3
• Kitaev interactions between j=1/2 moments in honeycomb Na2IrO3 are large and ferromagnetic: insights from ab initio quantum chemistry calculations
• Novel magnetism of Ir5+ ions in the double perovskite Sr2YIrO6
• Testing the validity of the strong spin-orbit-coupling limit for octahedrally coordinated iridates in a model system Sr${}_3$CuIrO${}_6$
• A valence bond liquid on the honeycomb lattice
• NaIrO3 - A pentavalent post-perovskite
• Orbital reconstruction in nonpolar tetravalent transition-metal oxide layers
• Lattice-Tuned Magnetism of Ru4+(4d4) Ions in Single-Crystals of the Layered Honeycomb Ruthenates: Li2RuO3 and Na2RuO3
• Fabrication of (111)-oriented Ca0.5Sr0.5IrO3/SrTiO3 superlattices; a designed playground for honeycomb physics
• Structural, Magnetic, and Electrical Properties of Li2Ir1-xRuxO3
• The Chemical Instability of Na2IrO3 in Air
• Structure and Properties of α-NaFeO2-type Ternary Sodium Iridates
• A new material for probing spin-orbit coupling in Iridates
• Evolution of Magnetism in the $N{a}_{3-d}N{a}_{1-x}M{g}_{x}I{r}_2{O}_6$ Series of Honeycomb Iridates

Cited by in corpus (14)

• Models and Materials for Generalized Kitaev Magnetism
• The Chemistry of Quantum Spin Liquids
• Hexagonal Perovskites as Quantum Materials
• Magnetic properties of restacked 2D spin $\frac{1}{2}$ honeycomb RuCl${}_3$ nanosheets
• Gapless quantum spin liquid in the triangular system Sr${}_3$CuSb${}_2$O${}_9$
• Nearly itinerant electronic groundstate in the intercalated honeycomb iridate Ag${}_3$LiIr${}_2$O${}_6$
• Structural evolution and electronic properties of (Sr1-xCax)2-yIrO4+z spin-orbit assisted insulators
• Evidence of quantum spin liquid state in a Cu${}^{2+}$-based $S=1/2$ triangular lattice antiferromagnet
• Competing spin-orbital singlet states in the 4$d^4$ honeycomb ruthenate Ag${}_3$LiRu${}_2$O${}_6$
• New Buckled Honeycomb Lattice Compound Sr3CaOs2O9 Exhibiting Antiferromagnetism above Room Temperature
• Evidences for the random singlet phase in a new honeycomb iridate SrIr${}_2$O${}_{6-\delta }$
• On the electronic ground state of two non-magnetic pentavalent honeycomb iridates
• Sr${}_3$Ir${}_2$O${}_7$F${}_2$: Topochemical conversion of a relativistic Mott state into a spin-orbit driven band insulator
• Thermal transport properties of IrSbSe