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Paper   IPM / Physic / 6740
School of Physics
  Title:   Phase Diagram of Ferrimagnetic Ladders with Bond Alternation
  Author(s): 
1.  A. Langari
2.  M. Abolfath
3.  M.A. Martin-Delgado
  Status:   Published
  Journal: Phys. Rev. B
  No.:  48
  Vol.:  61
  Year:  2000
  Pages:   343-348
  Supported by:  IPM
  Abstract:
We study the phase diagram of a 2-leg bond-alternation spin-(1/2, 1) ladder for two different configurations using a quantum renormalization group approach. Although d-dimensional ferrimagnets show gapless behavior, we will explicitly show that the effect of the spin mixing and the bond-alternation can open the possibility for observing an energy gap. We show that the gapless phases of such systems can be equivalent to the 1-dimensional half-integer antiferroamgnets, besides the gapless ferrimagnetic phases. We therefore propose a phase transition between these two gapless phases that can be seen in the parameter space.

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