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|Title: ||Neutron study of the magnetism in NiCl2•4SC(NH2)2|
|Authors: ||Tsyrulin, N|
|Issue Date: ||29-May-2013|
|Publisher: ||IOP Publishing Ltd.|
|Citation: ||Tsyrulin, N., Batista, C. D., Zapf, V. S., Jaime, M., Hansen, B. R., Niedermayer, C., Rule, K. C., Habicht, K., Prokes, K., Kiefer, K., Ressouche, E., Paduan, A., & Kenzelmann, M. (2013). Neutron study of the magnetism in NiCl2•4SC(NH2)2. Journal of Physics-Condensed Matter, 25 (21), Article Number 16008. doi:10.1088/0953-8984/25/21/216008|
|Abstract: ||We study the strongly anisotropic quasi-one-dimensional S = 1 quantum magnet NiCl2 center dot 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 H-c1. For H-c1 < H < H-c2, where H-c2 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 m(tot) = 2.1 mu(B) at the field mu H-0 = 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 > H-c2, 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.© 2013 IOP Publishing LTD.|
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