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${}^{5+}$.

8 pages, 7 figures

References in corpus (7)

• Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models
• Novel Jeff = 1/2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr2IrO4
• Quantum spin Hall effect in a transition metal oxide Na2IrO3
• Crystal field splitting and correlation effect on the electronic structure of A2IrO3
• Robustness of basal-plane antiferromagnetic order and the $J_{eff}=1/2$ state in single-layer iridate spin-orbit Mott insulators
• Similar glassy features in the NMR response of pure and disordered La1.88Sr0.12CuO4
• Low energy spin dynamics in the antiferromagnetic phase of CaFe2As2

Cited by in corpus (2)

• Magnetism out of disorder in a J=0 compound Ba2YIrO6
• Unconventional magnetism in the 4d${}^4$ based ($S=1$) honeycomb system Ag${}_3$LiRu${}_2$O${}_6$