Lattice-site-specific spin-dynamics in double perovskite Sr2CoOsO6

Abstract

We have studied the magnetic properties and spin-dynamics of the structurally-ordered double perovskite Sr${}_2$CoOsO${}_6$. Our neutron diffraction, muon spin relaxation and ac-susceptibility measurements reveal two antiferromagnetic (AFM) phases on cooling from room temperature down to 2 K. In the first AFM phase, with transition temperature $T_{\mathrm{N}}=108$ K, cobalt (3$d^7$, $S=3/2$) and osmium (5$d^2$, $S=1$) moments fluctuate dynamically, while their \textit{average} effective moments undergo long-range order. In the second AFM phase with $T_{\mathrm{N}}=67$ K, cobalt moments first become frozen and induce a noncollinear spin-canted AFM state, while dynamically fluctuating osmium moments are later frozen into a randomly canted state at $T\approx 5$ K. Our \textit{ab initio} calculations indicate that the effective exchange coupling between cobalt and osmium sites is rather weak, so that cobalt and osmium sublattices exhibit different ground states and spin-dynamics, making Sr${}_2$CoOsO${}_6$ distinct from previously reported double-perovskite compounds.

Accepted by Phys. Rev. Lett. 12 pages, 3 figures and 1 table

References in corpus (1)

• Theory of High T${}_c$ Ferrimagnetism in a Multi-orbital Mott Insulator

Cited by in corpus (23)

• Altermagnetism: Exploring New Frontiers in Magnetism and Spintronics
• Ab-inito study of low temperature magnetic properties of double perovskite Sr2FeOsO6
• Ferromagnetism above 1000 K in highly cation-ordered double-perovskite insulator Sr3OsO6
• Effect of Chemical Pressure on High Temperature Ferrimagnetic Double Perovskites Sr2CrOsO6 and Ca2CrOsO6
• Ferrimagnetism in the double perovskite Ca2FeOsO6: a density functional study
• Long-range magnetic interaction and frustration in double perovskite Sr${}_2$NiIrO${}_6$
• Effects of chemical pressure on the magnetic ground states of the osmate double perovskites SrCaCoOsO6 and Ca2CoOsO6
• Active role of the nonmagnetic cations in magnetic interactions for the double-perovskite Sr2BOsO6 (B=Y, In, Sc)
• Spin-orbit coupling control of anisotropy, ground state and frustration in 5d2 Sr2MgOsO6
• Orbital ordering of Ir-t2g states in the double perovskite Sr2CeIrO6
• Band-Mott mixing hybridizes the gap in Fe${}_2$Mo${}_3$O${}_8$
• Evidence of a cluster spin-glass state in the B-site disordered perovskite SrTi0.5Mn0.5O3
• Magnetically driven loss of centrosymmetry in metallic Pb2CoOsO6
• Spin-phonon interactions and magnetoelectric coupling in Co${}_4$$B_2$O${}_9$ ($B$ = Nb, Ta)
• Selective Control of Surface Spin Current in Topological Materials based on Pyrite-type OsX2 (X = Se, Te) Crystals
• Muon-spin relaxation study of the double perovskite insulators Sr${}_{2}B$OsO${}_6$ ($B=\mathrm{Fe},\mathrm{Y},\mathrm{In}$)
• Influence of the Magnetic Sub-Lattices in the Double Perovskite Compound LaCaNiReO${}_6$
• Magnetic frustration in the cubic double perovskite Ba2NiIrO6
• Neutron Scattering Investigation of Rhenium Orbital Ordering in $3d-5d$ Double Perovskite Ca${}_2$FeReO${}_6$
• Static and Fluctuating Magnetic Moments in the Ferroelectric Metal LiOsO${}_3$
• From Frustrated to Unfrustrated: Coupling two triangular-lattice itinerant Quantum Magnets
• Novel slow dynamics of phase transition in the partially ordered frustrated magnet DyRu2Si2
• Crystal Growth of a New 8H Perovskite Sr8Os6.3O24 Exhibiting High TC Ferromagnetism