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@ARTICLE{Bera:190095,
      author       = {Bera, A. K. and Lake, B. and Islam, A. T. M. N. and Janson,
                      O. and Rosner, H. and Schneidewind, A. and Park, J. T. and
                      Wheeler, E. and Zander, S.},
      title        = {{C}onsequences of critical interchain couplings and
                      anisotropy on a {H}aldane chain},
      journal      = {Physical review / B},
      volume       = {91},
      number       = {14},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2015-03053},
      pages        = {144414},
      year         = {2015},
      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 (Δ0≈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⊥ phase diagram [T.
                      Sakai and M. Takahashi, Phys. Rev. B 42, 4537 (1990)],
                      showing where it lies within the spin-liquid phase.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / JCNS-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)PANDA-20140101 / EXP:(DE-MLZ)PUMA-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000353031100004},
      doi          = {10.1103/PhysRevB.91.144414},
      url          = {https://juser.fz-juelich.de/record/190095},
}