Spin Waves in the Ferromagnetic Ground State of the Kagome Staircase System Co3V2O8

M. Ramazanoglu (1) , C.P. Adams (1 , 2) , J.P. Clancy (1) , A.J. Berlinsky (1 , 3) , Z. Yamani (4) , R. Szymczak (5)

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H. Szymczak (5) J. Fink-Finowicki (5) B.D. Gaulin (1 3) ((1) Department of Physics Astronomy McMaster University Hamilton Ontario Canada (2) Department of Physics St. Francis Xavier University Antigonish Nova Scotia Canada (3) Canadian Institute for Advanced Research Toronto Canada (4) Canadian Neutron Beam Centre National Research Council Chalk River Laboratories Chalk River Canada (5) Institute of Physics Polish Academy of Sciences Warsaw Poland)

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classification ❄️ cond-mat.dis-nn cond-mat.str-el

keywords magnetickagomespin-wavesystembelowco3v2o8displaysferromagnetic

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Inelastic neutron scattering measurements were performed on single crystal Co3V2O8 wherein magnetic cobalt ions reside on distinct spine and cross-tie sites within kagome staircase planes. This system displays a rich magnetic phase diagram which culminates in a ferromagnetic ground state below Tc~6 K. We have studied the low-lying magnetic excitations in this phase within the kagome plane. Despite the complexity of the system at higher temperatures, linear spin-wave theory describes most of the quantitative detail of the inelastic neutron measurements. Our results show two spin-wave branches, the higher energy of which displays finite spin-wave lifetimes well below Tc, and negligible magnetic exchange coupling between Co moments on the spine sites.

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Spin Waves in the Ferromagnetic Ground State of the Kagome Staircase System Co3V2O8

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