Neutron study of the magnetism in NiCl2⋅4SC(NH2)2

N. Tsyrulin, C. D. Batista, V. S. Zapf, M. Jaime, Britt Rosendahl Hansen, C. Niedermayer, K. C. Rule, Kirsten Silvia Habicht, K. Prokes, K. Kiefer, E. Ressouche, A. Paduan-Filho, M. Kenzelmann

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Abstract

We study the strongly anisotropic quasi-one-dimensional S = 1 quantum magnet NiCl2⋅4SC(NH2)2 using elastic and inelastic neutron scattering. We demonstrate that a magnetic field splits the excited doublet state and drives the lower doublet state to zero energy at a critical field Hc1. For Hc1 <H <Hc2, where Hc2 indicates the transition to a fully magnetized state, three-dimensional magnetic order is established with the AF moment perpendicular to the magnetic field. We mapped the temperature/magnetic field phase diagram, and we find that the total ordered magnetic moment reaches mtot = 2.1 μB at the field μH = 6 T and is thus close to the saturation value of the fully ordered moment. We study the magnetic spin dynamics in the fully magnetized state for H > Hc2, and we demonstrate the presence of an AF interaction between Ni2+ on the two interpenetrating sublattices. In the antiferromagnetically ordered phase, the spin-waves that develop from the lower-energy doublet are split into two modes. This is most likely the result of the presence of the AF interaction between the interpenetrating lattices.
Original languageEnglish
Article number216008
JournalJournal of Physics: Condensed Matter
Volume25
Issue number21
Pages (from-to)216008
Number of pages12
ISSN0953-8984
DOIs
Publication statusPublished - 2013
Externally publishedYes

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