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| Paper IPM / Physic / 8927 |
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| Abstract: | |||||
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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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