Magnetic Excitations in the Spin-1 Anisotropic Heisenberg Antiferromagnetic Chain System NiCl24SC(NH2)2

S. A. Zvyagin, J. Wosnitza, C. D. Batista, M. Tsukamoto, N. Kawashima, J. Krzystek, V. S. Zapf, M. Jaime, N. F. Oliveira, Jr., and A. Paduan-Filho
Phys. Rev. Lett. 98, 047205 – Published 26 January 2007

Abstract

NiCl24SC(NH2)2 (DTN) is a quantum S=1 chain system with strong easy-pane anisotropy and a new candidate for the Bose-Einstein condensation of the spin degrees of freedom. ESR studies of magnetic excitations in DTN in fields up to 25 T are presented. Based on analysis of the single-magnon excitation mode in the high-field spin-polarized phase and previous experimental results [Phys. Rev. Lett. 96, 077204 (2006)], a revised set of spin-Hamiltonian parameters is obtained. Our results yield D=8.9   K, Jc=2.2   K, and Ja,b=0.18   K for the anisotropy, intrachain, and interchain exchange interactions, respectively. These values are used to calculate the antiferromagnetic phase boundary, magnetization, and the frequency-field dependence of two-magnon bound-state excitations predicted by theory and observed in DTN for the first time. Excellent quantitative agreement with experimental data is obtained.

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  • Received 22 October 2006

DOI:https://doi.org/10.1103/PhysRevLett.98.047205

©2007 American Physical Society

Authors & Affiliations

S. A. Zvyagin1, J. Wosnitza1, C. D. Batista2, M. Tsukamoto3, N. Kawashima3, J. Krzystek4, V. S. Zapf5, M. Jaime5, N. F. Oliveira, Jr.6, and A. Paduan-Filho6

  • 1Dresden High Magnetic Field Laboratory (HLD), Forschungszentrum Dresden—Rossendorf, 01314 Dresden, Germany
  • 2Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 3Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 227-8581, Japan
  • 4National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USA
  • 5National High Magnetic Field Laboratory, Los Alamos National Laboratory, MS-E536, Los Alamos, New Mexico 87545, USA
  • 6Instituto de Fisica, Universidade de Sao Paulo, 05315-970 Sao Paulo, Brazil

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Issue

Vol. 98, Iss. 4 — 26 January 2007

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