Session Y27: Focus Session: Kagome Magnets

11:15 AM–2:15 PM, Friday, March 14, 2008
Morial Convention Center Room: 219

Sponsoring Unit: GMAG
Chair: Ying Chen, National Institute of Standards and Technology

Abstract ID: BAPS.2008.MAR.Y27.14

Abstract: Y27.00014 : Spin Waves in the Ferromagnetic Ground State of the Kagome Staircase System Co$_{3}$V$_{2}$O$_{8}$

1:51 PM–2:03 PM

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Authors:

Mehmet Ramazanoglu
(Dept. of Physics and Astronomy, McMaster Univ., Hamilton, ON, Canada)

J. Pat Clancy
(Dept. of Physics and Astronomy, McMaster Univ., Hamilton, ON, Canada )

A. John Berlinsky
(Dept. of Physics and Astronomy, McMaster Univ., Hamilton, ON, Canada )

Bruce D. Gaulin
(Dept. of Physics and Astronomy, McMaster Univ., Hamilton, ON, Canada )

Carl Adams
(Dept. of Physics, St. Francis Xavier Univ., Antigonish, NS, Canada )

Zahra Yamani
(NRC,CNBC,Chalk River, ON, Canada )

Ritta Szymczak
(Inst. of Physics, Polish Academy of Sciences, Poland)

Henryk Szymczak
(Inst. of Physics, Polish Academy of Sciences, Poland)

Jan Fink-Finowicki
(Inst. of Physics, Polish Academy of Sciences, Poland)

We have performed inelastic neutron scattering measurements on a single crystal sample of cobalt vanadate, Co$_{3}$V$_{2}$O$_{8}$ (CVO). The magnetic Co ions in CVO decorate a stacked, Kagome staircase crystal structure, and the system displays a complex sequence of ordered magnetic phases, culminating in a ferromagnetic phase at low $T$ [1,2]. We studied the spin wave dispersion relations and intensities within the Kagome planes and in the low temperature ferromagnetic phase which the system enters below $T_{c}\sim$6 K. Linear spin wave theory can model the qualitative features and much quantitative detail of these inelastic neutron measurements. These results show strongly anisotropic exchange interactions within this plane, and interesting finite lifetimes to the spin waves well below $T_{c}$. \newline [1] R. Szymczak et. al. PRB 73, 094425, (2006) \newline [2] Y. Chen et. al. PRB 74,014430, (2006)

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.MAR.Y27.14