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

Abstract

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 vicinity of the quantum critical points (QCPs) the acoustic $c_{33}$ mode manifests a pronounced softening accompanied by energy dissipation of the sound wave. The acoustic anomalies are traced up to $T>T_N$, where the thermodynamic properties are determined by fermionic magnetic excitations, the "hallmark" of one-dimensional (1D) spin chains. On the other hand, as established in earlier studies, the AF phase in DTN is governed by bosonic magnetic excitations. Our results suggest the presence of a crossover from a 1D fermionic to a 3D bosonic character of the magnetic excitations in DTN in the vicinity of the QCPs.

arXiv comment5 pages, 4 figures. Accepted for publication by Phys. Rev B

References in corpus (6)

• Dimensional reduction at a quantum critical point
• Bose-Einstein Condensation of S = 1 Ni spin degrees of freedom in NiCl2-4SC(NH2)2
• Bose-Einstein Condensation of Magnons in Cs2CuCl4
• Magnetic Excitations in the Spin-1 Anisotropic Heisenberg Antiferromagnetic Chain System NiCl${}_2$-4SC(NH${}_2$)${}_2$
• Universal temperature dependence of the magnetization of gapped spin chains
• Field induced long-range-ordering in an S=1 quasi-one-dimensional Heisenberg antiferromagnet

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• Enhanced spin correlations in the Bose-Einstein condensate compound Sr3Cr2O8
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• Pressure-tuned quantum criticality in the large-$D$ antiferromagnet DTN
• Giant caloric effects in spin chain materials
• Bose-Einstein Condensation of Magnons in NiCl2-4SC(NH2)2
• Quantum magnets with large single-ion easy-plane anisotropy in transverse magnetic field