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@ARTICLE{Zhang:192610,
      author       = {Zhang, Jian and Wölfel, Alexander and Bykov, Maxim and
                      Schönleber, Andreas and van Smaalen, Sander and Kremer,
                      Reinhard K. and Williamson, Hailey L.},
      title        = {{T}ransformation between spin-{P}eierls and incommensurate
                      fluctuating phases of {S}c-doped {T}i{OC}l},
      journal      = {Physical review / B},
      volume       = {90},
      number       = {1},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PUBDB-2014-04192},
      pages        = {014415},
      year         = {2014},
      abstract     = {Single crystals of ScxTi1−xOCl(x=0.005) have been grown
                      by the vapor phase transport technique. Specific heat
                      measurements prove the absence of phase transitions for
                      4–200 K. Instead, an excess entropy is observed over a
                      range of temperatures that encompasses the incommensurate
                      phase transition at 90 K and the spin-Peierls transition at
                      67 K of pure TiOCl. Temperature-dependent x-ray diffraction
                      on ScxTi1−xOCl gives broadened diffraction maxima at
                      incommensurate positions between Tc1=61.5(3) and ∼90 K,
                      and at commensurate positions below 61.5 K. These results
                      are interpreted as due to the presence of an incommensurate
                      phase without long-range order at intermediate temperatures,
                      and of a highly disturbed commensurate phase without
                      long-range order at low temperatures. The commensurate phase
                      is attributed to a fluctuating spin-Peierls state on an
                      orthorhombic lattice. The monoclinic symmetry and local
                      structure of the fluctuations are equal to the symmetry and
                      structure of the ordered spin-Peierls state of TiOCl. A
                      novel feature of ScxTi1−xOCl(x=0.005) is a transformation
                      from one fluctuating phase (the incommensurate phase at
                      intermediate temperatures) to another fluctuating phase (the
                      spin-Peierls-like phase). This transformation is not a phase
                      transition occurring at a critical temperature, but it
                      proceeds gradually over a temperature range of ∼10 K wide.
                      The destruction of long-range order requires much lower
                      levels of doping in TiOCl than in other low-dimensional
                      electronic crystals, like the canonical spin-Peierls
                      compound CuGeO3. An explanation for the higher sensitivity
                      to doping has not been found, but it is noticed that it may
                      be the result of an increased two-dimensional character of
                      the doped magnetic system. The observed fluctuating states
                      with long correlation lengths are reminiscent of
                      Kosterlitz–Thouless-type phases in two-dimensional
                      systems.},
      cin          = {DOOR},
      ddc          = {530},
      cid          = {I:(DE-H253)HAS-User-20120731},
      pnm          = {DORIS Beamline D3 (POF2-54G13)},
      pid          = {G:(DE-H253)POF2-D3-20130405},
      experiment   = {EXP:(DE-H253)D-D3-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000339443700002},
      doi          = {10.1103/PhysRevB.90.014415},
      url          = {https://bib-pubdb1.desy.de/record/192610},
}