Abstract
Quasi-one-dimensional magnet NiCl2·4SC(NH2)2 denoted as DTN remains disordered in zero magnetic field down to T = 0: the Sz = 0 ground state is separated from Sz =±1 excitations by a gap caused by strong single-ion easy-plane anisotropy acting on the Ni2+ ions. When a magnetic field is applied along the principal axis of anisotropy, the gap closes in a field above Bc1 = 2.18 T and the field-induced antiferromagnetic order arises. There are two excitation branches in this field-induced phase, one of which should be the Goldstone mode. Recent studies of the excitation spectrum in the field-induced ordered phase of the DTN magnet (T. Soldatov et al., Phys. Rev. B 101, 104410 (2020)) have revealed that the Goldstone mode acquires a gap in the excitation spectrum of the field-induced phase at a small deviation of the applied magnetic field from the tetragonal axis of the crystal. In this work, a simple description of both magnetic resonance branches in the ordered phase of a quasi-one-dimensional quantum S = 1 magnet with strong single-ion anisotropy is proposed. This approach is based on a combination of an effective strong coupling model for an anisotropic spin chain and the classical antiferromagnetic resonance theory. This description reproduces the experimental results semi-quantitatively without additional parameters.
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Acknowledgments
I am grateful to A.I. Smirnov and T.A. Soldatov (Kapitza Institute for Physical Problems, Russian Academy of Sciences) for numerous fruitful discussions.
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Russian Text © The Author(s), 2020, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2020, Vol. 112, No. 10, pp. 688–692.
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This work was supported by the Russian Science Foundation (project no. 17-12-01505) and by the Presidium of the Russian Academy of Sciences (program “Actual Problems of Low Temperature Physics”).
Translated by L. Mosina
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Glazkov, V.N. Antiferromagnetic Resonance in a Spin-Gap Magnet with Strong Single-Ion Anisotropy. Jetp Lett. 112, 647–650 (2020). https://doi.org/10.1134/S0021364020220099
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DOI: https://doi.org/10.1134/S0021364020220099