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Paper   IPM / Physic / 8928
School of Physics
  Title:   Spin Liquid Phase of XXZ s=1/2 Heisenberg Chain in A Transverse Magnetic Field
1.  J. Abouie
2.  A. Langari
3.  M. Siahatgar
  Status:   Preprint
  Year:  2008
  Supported by:  IPM
We have investigated the zero and finite temperature behavior of the XXZ spin-1/2 Heisenberg chain in the presence of a transverse magnetic field (h). The phase diagram of this model has been studied by exact diagonalization method. The standard order parameters (magnetization, staggered magnetization) and the entanglement estimators have been obtained at zero temperature. We have also studied the specific heat of the model versus temperature for different values of h. For an intermediate region (hf < h < hc) the specific heat has two maxima, a sharp and a broaden one. The broaden peak of the specific heat is the characteristic of a spin liquid phase where there is no long range order in the ground state. The entanglement estimators also justify the presence of spin liquid phase in the intermediate region.

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