Magnetic versus nonmagnetic polymorphs of RuBr${}_3$ under pressure

Abstract

Pressure evolution of the crystal structure and magnetism of the honeycomb $\alpha$-RuBr${}_3$ is studied using high-pressure x-ray diffraction, magnetometry, and density-functional band-structure calculations. Hydrostatic compression transforms antiferromagnetic $\alpha$-RuBr${}_3$ ($R\bar{3}$) into paramagnetic ${\alpha }^{\prime }$-RuBr${}_3$ ($P\bar{1}$) where short Ru-Ru bonds cause magnetism collapse above 1.3 GPa at 0 K and 2.5 GPa at 295 K. Below this critical pressure, the Néel temperature of $\alpha$-RuBr${}_3$ increases with the slope of 1.8 K/GPa. Pressure tunes $\alpha$-RuBr${}_3$ away from the Kitaev limit, whereas increased third-neighbor in-plane coupling and interlayer coupling lead to a further stabilization of the collinear zigzag state. Both $\alpha$- and ${\alpha }^{\prime }$-RuBr${}_3$ are metastable at ambient pressure, but their transformation into the thermodynamically stable $\beta$-polymorph is kinetically hindered at room temperature.

arXiv comment8 pages + Supplemental Material: published version

References in corpus (23)

• Anyons in an exactly solved model and beyond
• Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models
• Kitaev quantum spin liquid - concept and materialization
• Generic spin model for the honeycomb iridates beyond the Kitaev limit
• Models and Materials for Generalized Kitaev Magnetism
• Challenges in Design of Kitaev Materials: Magnetic Interactions from Competing Energy Scales
• Pseudospin exchange interactions in d^7 cobalt compounds: Possible realization of the Kitaev model
• Breakdown of Magnons in a Strongly Spin-Orbital Coupled Magnet
• Theoretical investigation of the magnetic dynamics in $\alpha$-RuCl${}_3$
• Pressure-induced dimerization and valence bond crystal formation in the Kitaev-Heisenberg magnet alpha-RuCl3
• Proximate ferromagnetic state in the Kitaev model material $\alpha$-RuCl${}_3$
• One Proximate Kitaev Spin Liquid in the $K$-$J$-$\Gamma$ Model on the Honeycomb Lattice
• Dynamical and thermal magnetic properties of the Kitaev spin liquid candidate $\alpha$-RuCl${}_3$
• Competition between spin-orbit coupling, magnetism, and dimerization in the honeycomb iridates: $\alpha$-Li${}_2$IrO${}_3$ under pressure
• Beyond Kitaev physics in strong spin-orbit coupled magnets
• Detuning the Honeycomb of $\alpha$-RuCl${}_3$: Pressure-Dependent Optical Studies Reveal Broken Symmetry
• Magnetoelastic coupling and effects of uniaxial strain in $\alpha$-RuCl${}_3$ from first principles
• Magnetism of Kitaev spin-liquid candidate material RuBr${}_3$
• Pressure-induced collapse of spin-orbital Mott state in the hyperhoneycomb iridate $\beta$-Li${}_2$IrO${}_3$
• Revealing frustrated local moment model for pressurized hyperhoneycomb iridate: paving a way toward quantum spin liquid
• Pressure-induced structural dimerization in the hyperhoneycomb iridate $\beta$-Li${}_2$IrO${}_3$ at low temperatures
• Magnetism in Kitaev Quantum Spin Liquid Candidate RuBr${}_3$
• Interplay of magnetism and dimerization in pressurized Kitaev material $\beta$-Li${}_2$IrO${}_3$

Cited by in corpus (2)

• Anisotropy of the zigzag order in the Kitaev honeycomb magnet $\alpha$-RuBr${}_3$
• Pressure-dependent magnetism of the Kitaev candidate Li${}_2$RhO${}_3$