Zero-energy excitation in the classical kagome antiferromagnet NaBa${}_2$Mn${}_3$F${}_{11}$

Abstract

We performed inelastic neutron scattering measurements on a polycrystalline sample of a classical kagome antiferromagnet NaBa${}_2$Mn${}_3$F${}_{11}$ to investigate the possibility of a dispersionless zero-energy excitation associated with rotation of spins along the chains. The observed spectra indeed exhibit such an excitation with strong intensity at low energy, as well as dispersive excitations with weak intensity at high energy. Combining the measurements with calculations from linear spin-wave theory reveals that NaBa${}_2$Mn${}_3$F${}_{11}$ is a good realization of the classical kagome antiferromagnet which exhibits a dispersionless mode lifted by the magnetic dipole-dipole interaction.

References in corpus (7)

• Topological Magnon Insulator in Insulating Ferromagnet
• Strongly correlated flat-band systems: The route from Heisenberg spins to Hubbard electrons
• Spin waves in the Frustrated Kagome Lattice Antiferromagnet KFe3(OH)6(SO4)2
• Classical dipoles on the kagome lattice
• Kagome-Triangular Lattice Antiferromagnet NaBa2Mn3F11
• Low-energy magnetic response of the noncentrosymmetric heavy-fermion superconductor CePt3Si studied via inelastic neutron scattering
• Persistence of the flat band in a kagome magnet with dipolar interactions