Spin waves and the origin of commensurate magnetism in Ba2CoGe2O7

Abstract

The square-lattice antiferromagnet Ba2CoGe2O7 is studied by means of neutron diffraction and inelastic scattering. This material is isostructural to the well-known Dzyaloshinskii-Moriya helimagnet Ba2CuGe2O7, but exhibits commensurate long-range Neel order at low temperatures. Measurements of the spin wave dispersion relation reveal strong in-plane anisotropy that is the likely reason for the suppression of helimagnetism.

5 pages 3 figures, submitted to Phys. Rev. B

References in corpus (7)

• Field-induced Commensurate-Incommensurate phase transition in a Dzyaloshinskii-Moriya spiral antiferromagnet
• Weak ferromagnetism and field-induced spin reorientation in K2V3O8
• Magnetic anisotropy and low-energy spin waves in the Dzyaloshinskii-Moriya spiral magnet Ba_2 Cu Ge_2 O_7
• Experimental evidence for Shekhtman-Entin-Wohlman-Aharony (SEA) interactions in Ba2CuGe2O7
• Field-induced incommensurate-to-commensurate transition in Ba_2CuGe_2O_7
• Intermediate phase in the spiral antiferromagnet Ba_2CuGe_2O_7
• The square-lattice spiral magnet Ba_2CuGe_2O_7 in an in-plane magnetic field

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• Chirality of Matter Shows Up via Spin Excitations
• Four-coloured Spin-wave Excitations in Multiferroic Materials
• Thermal Hall effect and topological edge states in a square lattice antiferromagnet
• Spin-stretching modes in anisotropic magnets: spin-wave excitations in the multiferroic Ba2CoGe2O7
• Theory of magnetoelectric resonance in two-dimensional $S=3/2$ antiferromagnet $\mathrm{B}{\mathrm{a}}_2\mathrm{CoG}{\mathrm{e}}_2{\mathrm{O}}_7$ via spin-dependent metal-ligand hybridization mechanism
• Spin Dynamics and Magnetoelectric Coupling Mechanism of Co4Nb2O9
• Theoretical investigation of magnetoelectric effects in Ba2CoGe2O7
• Spin nematic interaction in multiferroic compound Ba${}_2$CoGe${}_2$O${}_7$
• Electromagnon resonance in a collinear spin state of a polar antiferromagnet Fe2Mo3O8
• Gigantic magnetoelectric effect caused by magnetic-field-induced canted antiferromagnetic-paramagnetic transition in quasi-two-dimensional Ca${}_2$CoSi${}_2$O${}_7$ crystal
• Multiboson spin-wave theory for Ba2CoGe2O7, a spin-3/2 easy-plane Neel antiferromagnet with strong single-ion anisotropy
• Phase Diagram of the Dzyaloshinskii-Moriya Helimagnet Ba2CuGe2O7 in Canted Magnetic Fields
• Zero and finite temperature mean field study of magnetic field induced electric polarization in Ba2CoGe2O7
• Direct observation of spin-quadrupolar excitations in Sr${}_2$CoGe${}_2$O${}_7$ by high field ESR
• Double-k phase of the Dzyaloshinskii-Moriya helimagnet Ba2CuGe2O7
• Evolution of the 2D antiferromagnetism with temperature and magnetic field in multiferroic Ba${}_2$CoGe${}_2$O${}_7$
• Supersolid phase and magnetization plateaus observed in anisotropic spin-3/2 Heisenberg model on bipartite lattices
• Phase diagram of the square lattice Hubbard model with Rashba-type antisymmetric spin-orbit coupling
• Microwave non-reciprocity of magnon excitations in a non-centrosymmetric antiferromagnet Ba${}_2$MnGe${}_2$O${}_7$
• Raman phonon spectrum of the Dzyaloshinskii-Moriya helimagnet Ba2CuGe2O7
• Terahertz magnetoelectric response via electromagnons in magnetic oxides
• Discovering momentum-dependent magnon spin texture in insulating antiferromagnets: Role of the Kitaev interaction
• Infrared phonon spectrum of the tetragonal helimagnet Ba${}_2$CuGe${}_2$O${}_7$
• In-situ electric field control of THz non-reciprocal directional dichroism in the multiferroic Ba${}_2$CoGe${}_2$O${}_7$
• Magnetic Structure and Dielectric State in the Multiferroic Ca${}_2$CoSi${}_2$O${}_7$