Spin-orbit coupling control of anisotropy, ground state and frustration in 5d2 Sr2MgOsO6

Abstract

The influence of spin-orbit coupling (SOC) on the physical properties of the 5d2 system Sr2MgOsO6 is probed via a combination of magnetometry, specific heat measurements, elastic and inelastic neutron scattering, and density functional theory calculations. Although a significant degree of frustration is expected, we find that Sr2MgOsO6 orders in a type I antiferromagnetic structure at the remarkably high temperature of 108 K. The measurements presented allow for the first accurate quantification of the size of the magnetic moment in a 5d2 system of 0.60(2) muB - a significantly reduced moment from the expected value for such a system. Furthermore, significant anisotropy is identified via a spin excitation gap, and we confirm by first principles calculations that SOC not only provides the magnetocrystalline anisotropy, but also plays a crucial role in determining both the ground state magnetic order and the size of the local moment in this compound. Through comparison to Sr2ScOsO6, it is demonstrated that SOC-induced anisotropy has the ability to relieve frustration in 5d2 systems relative to their 5d3 counterparts, providing an explanation of the high TN found in Sr2MgOsO6.

Submitted to Scientific Reports

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Cited by in corpus (13)

• Octupolar vs Néel Order in Cubic 5$d^2$ double perovskites
• Octupolar order in d-orbital Mott insulators
• Orbital and spin order in spin-orbit coupled $d^1$ and $d^2$ double perovskites
• Antiferromagnetic long-range order in $5d^1$ double-perovskite Sr${}_2$MgReO${}_6$
• Interplay of spin-orbit coupling and hybridization in Ca3LiOsO6 and Ca3LiRuO6
• Small moments without long-range magnetic ordering in the zero-temperature ground state of the double-perovskite iridate Ba${}_2$YIrO${}_6$
• Magnetically induced metal-insulator transition in Pb2CaOsO6
• Neutron Scattering Investigation of Rhenium Orbital Ordering in $3d-5d$ Double Perovskite Ca${}_2$FeReO${}_6$
• Understanding the Curious Magnetic State of Sr${}_3$OsO${}_6$
• Correlated proton disorder in the crystal structure of the double hydroxide perovskite CuSn(OH)${}_6$
• Dipolar and quadrupolar correlations in the $5d^2$ Re-based double perovskites Ba${}_2$YReO${}_6$ and Ba${}_2$ScReO${}_6$
• Disordered ground state in the three-dimensional face-centred frustrated spin-$\frac{5}{2}$ system MnSn(OH)${}_{\text{6}}$
• Intersite Coulomb repulsion driven quadrupole instability and magnetic ordering in the orbital frustrated Ba${}_2$MgReO${}_6$