Lattice-Tuned Magnetism of Ru4+(4d4) Ions in Single-Crystals of the Layered Honeycomb Ruthenates: Li2RuO3 and Na2RuO3

Abstract

We synthesize and study single crystals of the layered honeycomb lattice Mott insulators Na2RuO3 and Li2RuO3 with magnetic Ru4+(4d4) ions. The newly found Na2RuO3 features a nearly ideal honeycomb lattice and orders antiferromagnetically at 30 K. Single-crystals of Li2RuO3 adopt a honeycomb lattice with either C2/m or more distorted P21/m below 300 K, depending on detailed synthesis conditions. We find that Li2RuO3 in both structures hosts a well-defined magnetic state, in contrast to the singlet ground state found in polycrystalline Li2RuO3. A phase diagram generated based on our results uncovers a new, direct correlation between the magnetic ground state and basal-plane distortions in the honeycomb ruthenates.

4 figures, accepted for publication in Phys. Rev. B

References in corpus (9)

• Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models
• On the Origin of Zigzag Magnetic Order in Iridium Oxide Na2IrO3
• Long range magnetic ordering in Na${}_2$IrO${}_3$
• Crystal field splitting and correlation effect on the electronic structure of A2IrO3
• Importance of anisotropic exchange interactions in honeycomb iridates. Minimal model for zigzag antiferromagnetic order in Na${}_2$IrO${}_3$
• A Spin-Orbital Singlet and Quantum Critical Point on the Diamond Lattice: FeSc2S4
• Spiral order in the honeycomb iridate Li2IrO3
• Crystal-field splitting for low symmetry systems in ab initio calculations
• Classical dimers and dimerized superstructure in orbitally degenerate honeycomb antiferromagnet

Cited by in corpus (6)

• Calculation of the exchange constants of the Heisenberg model in the plane-wave based methods using the Green's function approach
• Effective magnetic interactions in spin-orbit coupled $d^4$ Mott insulators
• Magnetism out of disorder in a J=0 compound Ba2YIrO6
• Spectroscopic signatures of molecular orbitals on a honeycomb lattice
• Correlated electron metal properties of the honeycomb ruthenate Na${}_2$RuO${}_3$
• The ground state in a proximity to a possible Kitaev spin liquid: An undistorted honeycomb iridate NaxIrO3 (0.60 < x < 0.80)