Spin Dynamics of $NiC{l}_2-4SC(N{H}_2{)}_2$ in the Field-Induced Ordered Phase

Abstract

$NiC{l}_2$-$4SC(N{H}_2{)}_2$ (known as DTN) is a spin-1 material with a strong single-ion anisotropy that is regarded as a new candidate for Bose-Einstein condensation (BEC) of spin degrees of freedom. We present a systematic study of the low-energy excitation spectrum of DTN in the field-induced magnetically ordered phase by means of high-field electron spin resonance measurements at temperatures down to 0.45 K. We argue that two gapped modes observed in the experiment can be consistently interpreted within a four-sublattice antiferromagnet model with a finite interaction between two tetragonal subsystems and unbroken axial symmetry. The latter is crucial for the interpretation of the field-induced ordering in DTN in terms of BEC.

arXiv comment4 pages, 3 figures

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• Bose-Einstein Condensation of Magnons in Cs2CuCl4
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• Spin-resonance modes of the spin-gap magnet TlCuCl_3
• Dynamics of anisotropic spin dimer system in strong magnetic field
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