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@ARTICLE{Tennant:22303,
      author       = {Tennant, D.A. and Lake, B. and James, A.J.A. and Essler,
                      F.H.L. and Notbohm, S. and Mikeska, H.-J. and Fielden, J.
                      and Kögerler, P. and Canfield, P.C. and Telling, M.T.F.},
      title        = {{A}nomalous dynamical line shapes in a quantum magnet at
                      finite temperature},
      journal      = {Physical review / B},
      volume       = {85},
      number       = {1},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PreJuSER-22303},
      pages        = {014402},
      year         = {2012},
      note         = {We thank Rick Paul (NIST) for measuring the deuteration of
                      the sample, S. Pfannenstiel (HZB) for storage, Felix Groitl
                      (HZB) for photograghy, and K. Damle (TFIR Mumbai) for
                      enlightening discussions. Work at the Ames Laboratory was
                      supported by the US Department of Energy, Basic Energy
                      Sciences, under Contract No. DE-AC02-07CH11358.},
      abstract     = {The effect of thermal fluctuations on the dynamics of a
                      gapped quantum magnet is studied using inelastic neutron
                      scattering on copper nitrate, a model material for the
                      spin-1/2, one-dimensional (1D) bond alternating Heisenberg
                      chain. A large, highly deuterated, single-crystal sample of
                      copper nitrate is produced using a solution growth method
                      and measurements are made using the high-resolution
                      backscattering spectrometer OSIRIS at the ISIS Facility.
                      Theoretical calculations and numerical analysis are combined
                      to interpret the physical origin of the thermal effects
                      observed in the magnetic spectra. The primary observations
                      are (1) a thermally induced central peak due to intraband
                      scattering, which is similar to Villain scattering familiar
                      from soliton systems in 1D, and (2) the one-magnon
                      quasiparticle pole is seen to develop with temperature into
                      an asymmetric continuum of scattering. We relate this
                      asymmetric line broadening to a thermal strongly correlated
                      state caused by hard-core constraints and quasiparticle
                      interactions. These findings are a counter example to recent
                      assertions of the universality of line broadening in 1D
                      systems and are applicable to a broad range of quantum
                      systems.},
      keywords     = {J (WoSType)},
      cin          = {PGI-6},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-6-20110106},
      pnm          = {Grundlagen für zukünftige Informationstechnologien},
      pid          = {G:(DE-Juel1)FUEK412},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000298861900001},
      doi          = {10.1103/PhysRevB.85.014402},
      url          = {https://juser.fz-juelich.de/record/22303},
}