Magnetic excitations in the spin-1 anisotropic antiferromagnet NiCl2-4SC(NH2)2
Magnetic excitations in the spin-1 anisotropic antiferromagnet NiCl2-4SC(NH2)2
Psaroudaki, C.; Zvyagin, S. A.; Krzystek, J.; Paduan-Filho, A.; Zotos, X.; Papanicolaou, N.
Abstract
The spin-1 anisotropic antiferromagnet NiCl2-4SC(NH2)2 exhibits a field-induced quantum phase transition that is formally analogous to Bose-Einstein condensation. Here we present results of systematic high-field electron spin resonance (ESR) experimental and theoretical studies of this compound with a special emphasis on single-ion two-magnon bound states. In order to clarify some remaining discrepancies between theory and experiment, the frequency-field dependence of magnetic excitations in this material is reanalyzed. In particular, a more comprehensive interpretation of the experimental signature of single-ion two-magnon bound states is shown to be fully consistent with theoretical results. We also clarify the structure of the ESR spectrum in the so-called intermediate phase.
Beteiligte Forschungsanlagen
- Hochfeld-Magnetlabor (HLD)
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Physical Review B 85(2012), 014412
DOI: 10.1103/PhysRevB.85.014412
Cited 14 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-18347