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Document type:
Zeitschriftenaufsatz 
Author(s):
Reich, C.; B̈oni, P.; Roessli, B.; Rastelli, E. 
Title:
Upward {{Renormalization}} of {{Fluctuations}} in ${\mathrm{C}\mathrm{s}\mathrm{M}\mathrm{n}\mathrm{B}\mathrm{r}}_{3}$ with {{Increasing Temperature}} 
Abstract:
The temperature dependence of the spin-wave gap in the triangular antiferromagnet CsMnBr3 was studied above the three-dimensional ordering temperature TN=8.3 K along the main symmetry directions using inelastic neutron scattering. We find at TN two gapped dispersive modes, whose energy increases with temperature. Moreover, the width of the spin-wave band along the [110] direction increases also. In a second session, polarization analysis was applied in order to extract explicitly the components...    »
 
Journal title:
Physical Review Letters 
Year:
2003 
Journal volume:
91 
Month:
oct 
Journal issue:
15 
Pages contribution:
157203