Origin of magnetic excitation gap in double perovskite Sr${}_2$FeOsO${}_6$

Abstract

Sr${}_2$FeOsO${}_6$ is an insulating double perovskite compound which undergoes antiferromagnetic transitions at 140 K ($T_{N1}$) and 67 K ($T_{N2}$). To study the underlying electronic and magnetic interactions giving rise to this behavior we have performed inelastic neutron scattering (INS) and resonant inelastic x-ray scattering (RIXS) experiments on polycrystalline samples of Sr${}_2$FeOsO${}_6$. The INS data reveal that the spectrum of spin excitations remains ungapped below T${}_{N1}$, however below T${}_{N2}$ a gap of 6.8 meV develops. The RIXS data reveals splitting of the T${}_{2g}$ multiplet consistent with that seen in other 5d${}^3$ osmium based double perovskites. Together these results suggest that spin-orbit coupling is important for ground state selection in 3d-5d${}^3$ double perovskite materials.

arXiv comment5 figures, supplementary material available on request

References in corpus (19)

• Proximate Kitaev Quantum Spin Liquid Behaviour in α-RuCl${}_3$
• Lattice Instability and Competing Spin Structures in the Double Perovskite Insulator Sr2FeOsO6
• The frustrated FCC antiferromagnet Ba2YOsO6: structural characterization, magnetic properties and neutron scattering studies
• Ab-inito study of low temperature magnetic properties of double perovskite Sr2FeOsO6
• Synthesis, Crystal Structure and Physical Properties of Sr2FeOsO6
• Emergent excitation at the magnetic metal-insulator transition in the pyrochlore osmate Cd2Os2O7
• Determination of Hund's coupling in 5d Oxides using Resonant Inelastic X-ray Scattering
• Effect of Chemical Pressure on High Temperature Ferrimagnetic Double Perovskites Sr2CrOsO6 and Ca2CrOsO6
• Spin-orbit coupling controlled $J=3/2$ electronic ground state in 5$d^3$ oxides
• Spin-orbit coupling controlled ground state in Sr${}_2$ScOsO${}_6$
• Understanding the Magnetic Puzzles of Double Perovskites A2FeOsO6 (A=Ca, Sr)
• Spin-orbit coupled systems in the "atomic" limit: rhenates, osmates, iridates
• Exotic magnetism on the quasi-FCC lattices of the $d^3$ double perovskites La${}_2$NaB${}^{\prime }$O${}_6$ (B${}^{\prime }$ $=$ Ru, Os)
• Spin Gap and the Nature of the 4d3 Magnetic Ground State in the Frustrated FCC Antiferromagnet Ba2YRuO6
• Strongly Gapped Spin-Wave Excitation in the Insulating Phase of NaOsO3
• Evolution of the magnetic excitations in NaOsO${}_3$ through its metal-insulator transition
• Crossover from itinerant to localized magnetic excitations through the metal-insulator transition in NaOsO${}_{\text{3}}$
• Interplay of spin-orbit coupling and hybridization in Ca3LiOsO6 and Ca3LiRuO6
• Muon-spin relaxation study of the double perovskite insulators Sr${}_{2}B$OsO${}_6$ ($B=\mathrm{Fe},\mathrm{Y},\mathrm{In}$)

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• Muon spin rotation and neutron scattering investigations of the B-site ordered double perovskite Sr2DyRuO6
• Magnetic excitations in double perovskite iridates La${}_2$$M$IrO${}_6$ ($M$ = Co, Ni, and Zn) mediated by 3$d$-5$d$ hybridization
• Spin-orbit coupling in a half-filled $t_{2g}$ shell: the case of $5d^3$ K${}_2$ReCl${}_6$
• Neutron Scattering Investigation of Rhenium Orbital Ordering in $3d-5d$ Double Perovskite Ca${}_2$FeReO${}_6$
• Impact of gapped spin-orbit excitons on low energy pseudospin exchange interactions
• Spin and Orbital Effects on Asymmetric Exchange Interaction in Polar Magnets: M(IO3)2 (M = Cu, Mn)