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@ARTICLE{Stasevich:46084,
      author       = {Stasevich, T. J. and Gebremariam, H. and Einstein, T. L.
                      and Giesen, M. and Steimer, C. and Ibach, H.},
      title        = {{L}ow-temperature orientation dependence of step stiffness
                      on {111} surfaces},
      journal      = {Physical review / B},
      volume       = {71},
      number       = {24},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PreJuSER-46084},
      pages        = {245414},
      year         = {2005},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {For hexagonal nets, descriptive of {111} fcc surfaces, we
                      derive from combinatoric arguments a simple, low-temperature
                      formula for the orientation dependence of the surface step
                      line tension and stiffness, as well as the leading
                      correction, based on the Ising model with nearest-neighbor
                      (NN) interactions. Our formula agrees well with experimental
                      data for both Ag and Cu{111} surfaces, indicating that NN
                      interactions alone can account for the data in these cases
                      (in contrast to results for Cu{001}). Experimentally
                      significant corollaries of the low-temperature derivation
                      show that the step line tension cannot be extracted from the
                      stiffness and that with plausible assumptions the
                      low-temperature stiffness should have six-fold symmetry, in
                      contrast to the three fold symmetry of the crystal shape. We
                      examine Zia's exact implicit solution in detail, using
                      numerical methods for general orientations and deriving many
                      analytic results including explicit solutions in the two
                      high-symmetry directions. From these exact results we
                      rederive our simple result and explore subtle behavior near
                      close-packed directions. To account for the three-fold
                      symmetry in a lattice gas model, we invoke an
                      orientation-dependent trio interaction and examine its
                      consequences.},
      keywords     = {J (WoSType)},
      cin          = {ISG-3 / ISG-4 / CNI},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB43 / I:(DE-Juel1)VDB44 / I:(DE-Juel1)VDB381},
      pnm          = {Kondensierte Materie},
      pid          = {G:(DE-Juel1)FUEK242},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000230276900104},
      doi          = {10.1103/PhysRevB.71.245414},
      url          = {https://juser.fz-juelich.de/record/46084},
}