Diluted paramagnetic impurities in nonmagnetic Ba${}_2$YIrO${}_6$

Abstract

The cubic double perovskite Ba${}_2$YIrO${}_6$ has been investigated by the local probe techniques nuclear magnetic resonance (${}^{89}$Y NMR) and muon spin rotation (muSR). Both methods confirm the absence of magnetic long-range order in this compound but find evidence for diluted localized paramagnetic moments. NMR spin-lattice relaxation rate 1/T1 measurements suggest a slowing down of localized spin moments at low temperatures. An increase of the muSR spin-lattice relaxation rate lambda confirms the presence of weak magnetism in Ba${}_2$YIrO${}_6$ . However, these findings cannot be explained by the recently suggested excitonic type of magnetism. Instead, they point towards tiny amounts of localized paramagnetic spin centers leading to this magnetic response on the background of a simple nonmagnetic ground state of the 5d${}^4$ ($J=0)$ electronic configuration of Ir${}^{5+}$.

arXiv comment8 pages, 7 figures

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• Spin-orbit coupled systems in the "atomic" limit: rhenates, osmates, iridates
• Magnetism out of disorder in a J=0 compound Ba2YIrO6
• Impurity Moments Conceal Low-Energy Relaxation of Quantum Spin Liquids
• Evolution of the structural, magnetic and electronic properties of the triple perovskite Ba${}_3$CoIr${}_2$O${}_9$
• Unconventional magnetism in the 4d${}^4$ based ($S=1$) honeycomb system Ag${}_3$LiRu${}_2$O${}_6$
• Spin-orbit effects in pentavalent Iridates: Models and materials
• Strain induced changes of electronic properties of B-site ordered double perovskite Sr${}_2$CoIrO${}_6$ thin films
• Evidence for $J_{\mathrm{eff}}=0$ ground state and defect-induced spin glass behaviour in the pyrochlore osmate Y${}_2$Os${}_2$O${}_7$
• Magnetization dynamics fingerprints of an excitonic condensate $t_{2g}^4$ magnet
• Small moments without long-range magnetic ordering in the zero-temperature ground state of the double-perovskite iridate Ba${}_2$YIrO${}_6$
• Single crystal growth and magnetism of Sr3NaIrO6 and Sr3AgIrO6: tracking the J = 0 ground state of Ir5+
• Temperature-induced valence-state transition in double perovskite Ba2-xSrxTbIrO6