Alternating Heisenberg Spin-1/2 Chains in a Transverse Magnetic Field

Details Alternating Heisenberg Spin-1/2 Chains in a Transverse Magnetic Field Alternating Heisenberg Spin-1/2 Chains in a Transverse Magnetic Field

2007-11-05

arxiv.org/abs/0711.0623v1

J. Phys. Soc. Jpn. 77, 024710 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 7 figures

Scientific paper

10.1143/JPSJ.77.024710

The ground state phase diagram of the alternating spin-1/2 chains with anisotropic ferromagnetic coupling under the influence of a symmetry breaking transverse magnetic field is studied. We have used the exact diagonalization technique. In the limit where the antiferromagnetic coupling is dominant, we have identified two Ising-type quantum phase transitions. We have calculated two critical fields $h_{c_{1}}$ and $h_{c_{2}}$, corresponding to the transition between different magnetic phases of the system. It is found that the intermediate state ($h_{c_{1}}

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