Magnetic ordering and spin dynamics in the  S = 5/2  staggered triangular lattice antiferromagnet  Ba2MnTeO6

We report studies of the magnetic properties of a staggered stacked triangular lattice Ba2MnTeO6 using magnetic susceptibility, specific heat, neutron powder diffraction, inelastic neutron scattering measurements, and first-principles density functional theory calculations. Neutron diffraction measurements reveal Ba2MnTeO6 to be antiferromagnetically ordered with a propagation vector k=(0.5,0.5,0) and Néel transition temperature of TN≈20 K. The dominant interaction derived from the Curie-Weiss fitting to the inverse DC susceptibility is antiferromagnetic. Modeling of the inelastic neutron scattering data with linear spin wave theory yielded magnetic exchange interactions for the nearest intralayer, nearest interlayer, and next-nearest interlayer J1=0.27(3), meV J2=0.27(3) meV, and J3=−0.05(1) meV, respectively, and a small value of easy-axis anisotropy of Dzz=−0.01 meV. We derive a magnetic phase diagram that reveals a collinear stripe-type antiferromagnetic order that is stabilized by the competition between J1, J2, and J3. ©2020 American Physical Society

Keywords

Crystal lattices, Neutron diffraction, Antiferromagnetism, Spin exchange, Exchange interactions, Magnetism

Citation

Li, L., Narayanan, N., Jin, S., Yu, J., Liu, Z., Sun, H., Wang, C.-W., Peterson, V. K., Liu, Y., Danilkin, S., Yao, D.-X., Yu, D. & Wang, M. (2020). Magnetic ordering and spin dynamics in the S= 5/2 staggered triangular lattice antiferromagnet Ba2MnTeO6. Physical Review B, 102(9), 094413. doi:10.1103/PhysRevB.102.094413