2008/02/04 by S. A. Zvyagin, J. Wosnitza, A. K. Kolezhuk +9 · 35 citations
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Anisotropy #Antiferromagnetism #Charge (physics) #Chemistry #Condensed matter physics #Crystallography #Field (mathematics) #Organic and Molecular Conductors Research #Phase (matter) #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Spin (aerodynamics) #Tetragonal crystal system #Thermodynamics #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.77.092413
published in Physical Review B 77(9) (American Physical Society) · 4 pages, 3 figures
arxiv created 2008/02/04 · openalex publication_date 2008/03/28 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
NiCl2\text\ensuremath-4SC(NH2)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\phantom\rule0.3em0exK. 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.