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Paper   IPM / Physic / 8927
School of Physics
  Title:   A Signature for the Luttinger Liquid Phase in Alternating Heisenberg Spin-1/2 Chains
1.  J. Abouie
2.  S. Mahdavifar
  Status:   Published
  Journal: Phys. Rev. B
  Vol.:  78
  Year:  2008
  Pages:   184437
  Supported by:  IPM
We have studied the zero and low-temperature behavior of anisotropic alternating antiferromagnetic-ferromagnetic Heisenberg spin-1/2 chains in a transverse magnetic field. Using the analytical spinless fermion approach, the thermodynamic behavior of the model has been studied. We have introduced a new order parameter to distinguish the gapless Luttinger liquid phase from the other gapped phases. We have found a double peak structure in the specific heat curves for the region between the two quantum critical points. Using numerical full diagonalization results, the existence of the double peak structure is confirmed.

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