Effect of nonmagnetic dilution in honeycomb lattice iridates Na${}_2$IrO${}_3$ and Li${}_2$IrO${}_3$

Abstract

We have synthesized single crystals of Na${}_2$(Ir${}_{1-x}$Ti${}_x$)O${}_3$ and polycrystals of Li${}_2$(Ir${}_{1-x}$Ti${}_x$)O${}_3$ and studied the effect of magnetic depletion on the magnetic properties by measurements of the magnetic susceptibility, specific heat and magnetocaloric effect at temperatures down to 0.1~K. In both systems, the non-magnetic substitution rapidly changes the magnetically ordered ground state into a spin glass, indicating strong frustration. While for the Li system the Weiss temperature ${\Theta }_{\mathrm{W}}$ remains unchanged up to $x=0.55$, a strong decrease $|{\Theta }_{\mathrm{W}}|$ is found for the Na system. This suggests that only for the former system magnetic exchange beyond nearest neighbors is dominating. This is also corroborated by the observation of a smeared quantum phase transition in Li${}_2$(Ir${}_{1-x}$Ti${}_x$)O${}_3$ near $x=0.5$, i.e. much beyond the site percolation threshold of the honeycomb lattice.

8 pages including supplemental, 12 figures

References in corpus (8)

• Novel Jeff = 1/2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr2IrO4
• Spin-Liquid State in the S = 1/2 Hyperkagome Antiferromagnet Na4Ir3O8
• On the Origin of Zigzag Magnetic Order in Iridium Oxide Na2IrO3
• Bandwidth-Controlled Insulator-Metal Transition and Correlated Metallic State in 5$d$ Transition Metal Oxides Sr${}_{n+1}$Ir${}_n$O${}_{3n+1}$ ($n$=1, 2, and $\infty$)
• Quantum spin Hall effect in a transition metal oxide Na2IrO3
• Crystal field splitting and correlation effect on the electronic structure of A2IrO3
• Spin liquid behaviour in Jeff=1/2 triangular lattice Ba3IrTi2O9
• Percolation quantum phase transitions in diluted magnets

Cited by in corpus (26)

• Models and Materials for Generalized Kitaev Magnetism
• Honeycomb-lattice Heisenberg-Kitaev model in a magnetic field: Spin canting, metamagnetism, and vortex crystals
• Honeycomb Layered Oxides: Structure, Energy Storage, Transport, Topology and Relevant Insights
• Spiral order in the honeycomb iridate Li2IrO3
• Theory of Magnetic Phase Diagrams in Hyperhoneycomb and Harmonic-honeycomb Iridates
• Confinement-Deconfinement Transition as an Indication of Spin-Liquid-Type Behavior in Na${}_2$IrO${}_3$
• Thermodynamic and Transport Properties in Disordered Kitaev Models
• Spin excitations of a proximate Kitaev quantum spin liquid realized in Cu${}_2$IrO${}_3$
• Observation of a random singlet state in a diluted Kitaev honeycomb material
• Spin-glass state and reversed magnetic anisotropy induced by Cr doping in the Kitaev magnet $\alpha$-RuCl${}_3$
• Spin dynamics in the Kitaev model with disorder: Quantum Monte Carlo study of dynamical spin structure factor, magnetic susceptibility, and NMR relaxation rate
• Kitaev magnetism through the prism of lithium iridate
• Susceptibility anisotropy and its disorder evolution in models for Kitaev materials
• Kitaev Spin Liquid Candidate OsxCl3 Comprised of Honeycomb Nano-Domains
• Hidden spin-orbital order in the Kitaev hyperhoneycomb $\beta$-Li${}_2$IrO${}_3$
• Nonmagnetic substitution in pyrochlore iridate Y${}_2$(Ir${}_{1-x}$Ti${}_x$)${}_2$O${}_7$: Structure, magnetism and electronic properties
• Suppression of the antiferromagnetic order by Zn doping in a possible Kitaev material Na${}_2$Co${}_2$TeO${}_6$
• Spin ice in a general applied magnetic field: Kasteleyn transition, magnetic torque and rotational magnetocaloric effect
• Dilution of the magnetic lattice in the Kitaev candidate $\alpha$-RuCl${}_3$ by Rh${}^{3+}$ doping
• Signatures of a gapless quantum spin liquid in the Kitaev material Na${}_3$Co${}_{2-x}$Zn${}_x$SbO${}_6$
• Minimal models of $\alpha$-Li${}_2$IrO${}_3$: On the range of the interactions, ground state properties, and magnetization processes
• Static and dynamical magnetic properties of the extended Kitaev-Heisenberg model with spin vacancies
• The nature of low-temperature spin-freezing in frustrated Kitaev magnets
• Topological Majorana flat bands in the Kitaev model on a Bishamon-kikko lattice
• Spin disorder state induced by Mg${}^{2+}$ doping in a Kitaev material Na${}_3$Co${}_2$SbO${}_6$
• Disorder, Low-Energy Excitations, and Topology in the Kitaev Spin Liquid