Low-energy excitations in DTN below Tc: ESR studies

NiCl2-4SC(NH2)2 (known as DTN) is an S 1 system with an easy-plane anisotropy dominating over the exchange interaction and exhibiting a field-induced antiferromagnetic ordering with critical fields Bc1=2.1 T, Bc2=12.6 T and temperature Tcmax ∼ 1.2 K. A systematic study of the low-energy excitation s...

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Veröffentlicht in:Journal of physics. Conference series 2009-03, Vol.150 (4), p.042244
Hauptverfasser: Zvyagin, Wosnitza, J, Kolezhuk, A K, Zapf, V S, Jaime, M, Paduan-Filho, A, Glazkov, V N, Sosin, S S, Smirnov, A I
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Sprache:eng
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Zusammenfassung:NiCl2-4SC(NH2)2 (known as DTN) is an S 1 system with an easy-plane anisotropy dominating over the exchange interaction and exhibiting a field-induced antiferromagnetic ordering with critical fields Bc1=2.1 T, Bc2=12.6 T and temperature Tcmax ∼ 1.2 K. A systematic study of the low-energy excitation spectrum of DTN in the ordered phase at temperatures down to 0.45 K is presented. It is showed that two observed gapped modes can be consistently interpreted within a four-sublattice antiferromagnet model with a weak isotropic corner-center interaction of magnetic ions in the body-centered tetragonal lattice.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/150/4/042244