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  Consequences of critical interchain couplings and anisotropy on a Haldane chain

Bera, A. K., Lake, B., Islam, A. T. M. N., Janson, O., Rosner, H., Schneidewind, A., et al. (2015). Consequences of critical interchain couplings and anisotropy on a Haldane chain. Physical Review B, 91(14): 144414, pp. 1-11. doi:10.1103/PhysRevB.91.144414.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0026-CC40-F Version Permalink: http://hdl.handle.net/21.11116/0000-0000-FF0E-3
Genre: Journal Article

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 Creators:
Bera, A. K.1, Author
Lake, B.1, Author
Islam, A. T. M. N.1, Author
Janson, O.2, Author              
Rosner, H.3, Author              
Schneidewind, A.1, Author
Park, J. T.1, Author
Wheeler, E.1, Author
Zander, S.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
3Helge Rosner, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863450              

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 Abstract: Effects of interchain couplings and anisotropy on a Haldane chain have been investigated by single-crystal inelastic neutron scattering and density functional theory (DFT) calculations on the model compound SrNi2V2O8. Significant effects on low-energy excitation spectra are found where the Haldane gap (Delta(0) approximate to 0.41J, where J is the intrachain exchange interaction) is replaced by three energy minima at different antiferromagnetic zone centers due to the complex interchain couplings. Further, the triplet states are split into two branches by single-ion anisotropy. Quantitative information on the intrachain and interchain interactions as well as on the single-ion anisotropy is obtained from the analyses of the neutron scattering spectra by the random-phase approximation method. The presence of multiple competing interchain interactions is found from the analysis of the experimental spectra and is also confirmed by the DFT calculations. The interchain interactions are two orders of magnitude weaker than the nearest-neighbor intrachain interaction J = 8.7 meV. The DFT calculations reveal that the dominant intrachain nearest-neighbor interaction occurs via nontrivial extended superexchange pathways Ni-O-V-O-Ni involving the empty d orbital of V ions. The present single-crystal study also allows us to correctly position SrNi2V2O8 in the theoretical D-J(perpendicular to) phase diagram [T. Sakai and M. Takahashi, Phys. Rev. B 42, 4537 (1990)], showing where it lies within the spin-liquid phase.

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Language(s): eng - English
 Dates: 2015-04-17
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 91 (14) Sequence Number: 144414 Start / End Page: 1 - 11 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008