Abstract
Inelastic neutron scattering experiments on the Haldane-gap quantum antiferromagnet $\mathrm{Ni}({\mathrm{C}}_{5}{\mathrm{D}}_{14}{\mathrm{N}}_{2}{)}_{2}{\mathrm{N}}_{3}({\mathrm{PF}}_{6})$ are performed at mK temperatures in magnetic fields of almost twice the critical field ${H}_{c}$ applied perpendicular to the spin chains. Above ${H}_{c}$ a reopening of the spin gap is clearly observed. In the high-field N\'eel-ordered state the spectrum is dominated by three distinct excitation branches. A theoretical model consistently describing the experimental data is proposed.
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