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19 April 2024

» arxiv » 0802.0352

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Spin Dynamics of $Ni Cl_2-4SC(NH_2)_2$ in the Field-Induced Ordered Phase
S. A. Zvyagin ; J. Wosnitza ; A. K. Kolezhuk ; V. S. Zapf ; M. Jaime ; A. Paduan-Filho ; V. N. Glazkov ; S. S. Sosin ; A. I. Smirnov ;
Date:	4 Feb 2008
Abstract:	$Ni Cl_2$-$4SC(NH_2)_2$ (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.
Source:	arXiv, 0802.0352
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