Unraveling the nature of magnetism of the 5${\mathbf{d}}^4$ double perovskite Ba${}_2$YIrO${}_6$

Abstract

We report electron spin resonance (ESR) spectroscopy results on the double perovskite Ba${}_2$YIrO${}_6$. On general grounds, this material is expected to be nonmagnetic due to the strong coupling of the spin and orbital momenta of Ir${}^{5+}$ (5$d^4$) ions. However, controversial experimental reports on either strong antiferromagnetism with static order at low temperatures or just a weakly paramagnetic behavior have triggered a discussion on the breakdown of the generally accepted scenario of the strongly spin-orbit coupled ground states in the 5$d^4$ iridates and the emergence of a novel exotic magnetic state. Our data evidence that the magnetism of the studied material is solely due to a few percent of Ir${}^{4+}$ and Ir${}^{6+}$ magnetic defects while the regular Ir${}^{5+}$ sites remain nonmagnetic. Remarkably, the defect Ir${}^{6+}$ species manifest magnetic correlations in the ESR spectra at $T\lesssim 20$ K suggesting a long-range character of superexchange in the double prevoskites as proposed by recent theories.

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• Spin-orbit effects in pentavalent Iridates: Models and materials
• Charge transfer energy in iridates: a hard x-ray photoelectron spectroscopy study
• Spin-Orbital Entangled Excitonic Insulators in $(t_{2g}{)}^4$ Correlated Electron Systems
• The effect of structural and magnetic disorder on the 3$d$-5$d$ exchange interactions of La${}_{2-x}$Ca${}_x$CoIrO${}_6$
• BCS-BEC crossover in a $(t_{2g}{)}^4$ Excitonic Magnet
• Spin-orbital excitons and their potential condensation in pentavalent iridates
• Vibronic excitations in resonant inelastic x-ray scattering spectra of K${}_2$RuCl${}_6$
• Gapless to gapless phase transitions in quantum spin chains
• Evidences for the random singlet phase in a new honeycomb iridate SrIr${}_2$O${}_{6-\delta }$
• Evidence for $J_{\mathrm{eff}}=0$ ground state and defect-induced spin glass behaviour in the pyrochlore osmate Y${}_2$Os${}_2$O${}_7$
• Magnetic reorientation transition in a three orbital model for $\mathrm{C}{\mathrm{a}}_2\mathrm{Ru}{\mathrm{O}}_4$ -- Interplay of spin-orbit coupling, tetragonal distortion, and Coulomb interactions
• Electronic excitations in $5d^4$ J=0 Os${}^{4+}$ halides studied by RIXS and optical spectroscopy
• Magnetic phase transitions in quantum spin-orbital liquids
• Multipolar ordering in the three-orbital Hubbard model
• Magnetization dynamics fingerprints of an excitonic condensate $t_{2g}^4$ magnet
• Spin-orbit coupling and crystal-field splitting in Ti-doped Ca2RuO4 studied by ellipsometry
• Spin-orbit coupling in a half-filled $t_{2g}$ shell: the case of $5d^3$ K${}_2$ReCl${}_6$
• Small moments without long-range magnetic ordering in the zero-temperature ground state of the double-perovskite iridate Ba${}_2$YIrO${}_6$
• Structural, electronic and magnetic properties of La${}_{1.5}$Ca${}_{0.5}$(Co${}_{0.5}$Fe${}_{0.5}$)IrO${}_6$ double perovskite
• Magnetic phases for two $t_{2g}$ holes with spin-orbit coupling and crystal field
• Unusual ferrimagnetic ground state in rhenium ferrite
• J = 0 nonmagnetic insulating state in K${}_2$Os$X_6$ (X = F, Cl and Br)
• Single crystal growth and magnetism of Sr3NaIrO6 and Sr3AgIrO6: tracking the J = 0 ground state of Ir5+
• Local site behavior of the 5d and 4f ions in the frustrated pyrochlore Ho2Os2O7
• Temperature-induced valence-state transition in double perovskite Ba2-xSrxTbIrO6