Magnetic excitations in the noncentrosymmetric magnet Sr2MnSi2O7

Abstract

Magnetic excitations in the noncentrosymmetric magnet Sr${}_2$MnSi${}_2$O${}_7$ were investigated through inelastic neutron scattering measurements. Major magnetic excitations are limited up to the energy transfer of 0.5 meV, and two magnon branches under zero magnetic field were well explained in the framework of linear spin-wave theory. The magnitudes of the square-lattice in-plane and inter-plane nearest-neighbor interactions, spin anisotropy term, and the Dzyaloshinskii-Moriya interaction are respectively estimated to be $J_1=45.54(5)$ $\mu$eV, $J_2=0.52(1)$ $\mu$eV, $\Lambda =4.98(11)$ $\mu$eV, $D_{xy}=0.02(9)$ $\mu$eV, and $D_z=4.10(1)$ $\mu$eV, and calculations using these parameters reproduce experimental data quite well. Sr${}_2$MnSi${}_2$O${}_7$ appears to have the smallest energy scale among the melilite-type compounds, and the small $J_2/J_1=0.0114(2)$ indicates the sufficient two-dimensionality.

6 pages, 5 figures

References in corpus (5)

• Spin current and magneto-electric effect in non-collinear magnets
• Multiferroic properties of an åkermanite Sr${}_2$CoSi${}_2$O${}_7$ single crystal in high magnetic fields
• Magnetization induced local electric dipoles and multiferroic properties of Ba2CoGe2O7
• Magnetic structure of the noncentrosymmetric magnet Sr2MnSi2O7 through irreducible representation and magnetic space group analyses
• Field-induced electric polarization and elastic softening caused by parity-mixed $d$-$p$ hybridized states with electric multipoles in Ba${}_2$CuGe${}_2$O${}_7$