Spin wave excitations in the pyrovanadate alpha-Cu2V2O7

Abstract

The pyrovanadate alpha-Cu2V2O7 belongs to the orthorhombic (Fdd2) class of crystals with noncentrosymmetric crystal structure. Recently, the compound has been identified to be a magnetic multiferroic with a substantial electric polarization below the magnetic transition temperature TC = 35 K. Here we report the results of our inelastic neutron scattering (INS) studies on a polycrystalline sample of alpha-Cu2V2O7. Our INS data clearly show the existence of dispersive spin wave excitations below TC with a zone-boundary energy of 11 meV at 5 K.We have analyzed the data using linear spin wave theory, which shows good agreement between the experiment and calculation. The analysis is consistent with the third nearest neighbor exchange interaction playing a dominant role in the magnetism of the material.

5 pages, 5 figures

References in corpus (6)

• Linear spin wave theory for single-Q incommensurate magnetic structures
• Electromagnons in multiferroic YMn2O5 and TbMn2O5
• beta-Cu2V2O7: a spin-1/2 honeycomb lattice system
• Colossal magnon-phonon coupling in multiferroic Eu${}_{0.75}$Y${}_{0.25}$MnO${}_3$
• Magnetic structure and Dzyaloshinskii-Moriya interaction in the $S=1/2$ helical-honeycomb antiferromagnet $\alpha$-Cu${}_2$V${}_2$O${}_7$
• Exchange striction induced giant ferroelectric polarization in copper based multiferroic material $\alpha$-Cu${}_2$V${}_2$O${}_7$

Cited by in corpus (5)

• Nonreciprocal magnons and symmetry-breaking in the noncentrosymmetric antiferromagnet
• High-field magnetization and magnetic phase diagram of $\alpha$-Cu${}_2$V${}_2$O${}_7$
• Magnetoelastic coupling and ferromagnetic-type in-gap spin excitations in multiferroic $\alpha$-Cu${}_2$V${}_2$O${}_7$
• Magnetic excitations and exchange parameters of a nickel chain compound PbMn${}_2$Ni${}_6$Te${}_3$O${}_{18}$: Neutron scattering and density functional theory studies
• Neutron scattering evidence for two-dimensionally coupled spin-dimerized antiferromagnetic lattice in α-Cu2P2O7