title: Spin-orbit coupling control of anisotropy, ground state and frustration in 5d(2) Sr2MgOsO6.
abstract: The influence of spin-orbit coupling (SOC) on the physical properties of the 5d(2) 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 5d(2) system of 0.60(2) μB -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 5d(2) systems relative to their 5d(3) counterparts, providing an explanation of the high TN found in Sr2MgOsO6.
authors: Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210-1185, USA.
authors: Ryan
authors: R
authors: Morrow
authors: Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
authors: Alice E
authors: AE
authors: Taylor
authors: Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211-7010, USA.
authors: D J
authors: DJ
authors: Singh
authors: Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210-1185, USA.
authors: Jie
authors: J
authors: Xiong
authors: Leibniz Institute for Solid State and Materials Research Dresden IFW, D-01171 Dresden, Germany.
authors: Steven
authors: S
authors: Rodan
authors: Leibniz Institute for Solid State and Materials Research Dresden IFW, D-01171 Dresden, Germany.
authors: A U B
authors: AU
authors: Wolter
authors: Leibniz Institute for Solid State and Materials Research Dresden IFW, D-01171 Dresden, Germany.|Institute for Solid State Physics, Technische Universität Dresden, D-01062 Dresden, Germany.
authors: Sabine
authors: S
authors: Wurmehl
authors: Leibniz Institute for Solid State and Materials Research Dresden IFW, D-01171 Dresden, Germany.|Institute for Solid State Physics, Technische Universität Dresden, D-01062 Dresden, Germany.
authors: Bernd
authors: B
authors: Büchner
authors: Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
authors: M B
authors: MB
authors: Stone
authors: Chemical and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
authors: A I
authors: AI
authors: Kolesnikov
authors: Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
authors: Adam A
authors: AA
authors: Aczel
authors: Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.|Department of Physics and Astronomy, The University of Tennessee, Knoxville, TN 37996, USA.
authors: A D
authors: AD
authors: Christianson
authors: Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210-1185, USA.
authors: Patrick M
authors: PM
authors: Woodward