Article

Magnetic Excitations in the Spin-1 Anisotropic Heisenberg Antiferromagnetic Chain System<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>NiCl</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mtext mathvariant="normal">−</mml:mtext><mml:mn>4</mml:mn><mml:mi>SC</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:msub><mml:mi>NH</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mo stretchy="false">)</mml:mo><mml:mn>2</mml:mn></mml:msub></mml:math>

S. A. ZvyaginDresden High Magnetic Field Laboratory (HLD), Forschungszentrum Dresden-Rossendorf, 01314 Dresden, GermanyJ. WosnitzaDresden High Magnetic Field Laboratory (HLD), Forschungszentrum Dresden—Rossendorf, 01314 Dresden, GermanyCristian D. BatistaTheoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USAM. TsukamotoInstitute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 227-8581, JapanNaoki KawashimaInstitute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 227-8581, JapanJ. KrzystekNational High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, USAVivien S. ZapfNational High Magnetic Field Laboratory, Los Alamos National Laboratory, MS-E536, Los Alamos, New Mexico 87545, USAM. JaimeNational High Magnetic Field Laboratory, Los Alamos National Laboratory, MS-E536, Los Alamos, New Mexico 87545, USAN. F. OliveiraInstituto de Fisica, Universidade de Sao Paulo, 05315-970 Sao Paulo, BrazilA. Paduan‐FilhoInstituto de Fisica, Universidade de Sao Paulo, 05315-970 Sao Paulo, Brazil

2007lv

ABI

Abstract

${\mathrm{NiCl}}_{2}\mathrm{\text{\ensuremath{-}}}4\mathrm{SC}({\mathrm{NH}}_{2}{)}_{2}$ (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 $D=8.9\text{ }\mathrm{K}$, ${J}_{c}=2.2\text{ }\mathrm{K}$, and ${J}_{a,b}=0.18\text{ }\mathrm{K}$ 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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Identifiers

DOI: 10.1103/physrevlett.98.047205

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Cited by 20 references

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