Character of magnetic excitations in a quasi-one-dimensional antiferromagnet near the quantum critical points: Impact on magneto-acoustic properties

O. Chiatti, A. Sytcheva, J. Wosnitza +5

We report results of magneto-acoustic studies in the quantum spin-chain magnet NiCl${}_2$-4SC(NH${}_2$)${}_2$ (DTN) having a field-induced ordered antiferromagnetic (AF) phase. In the vi…