Alternating Heisenberg Spin-1/2 Chains in a Transverse Magnetic Field(Condensed matter: electronic structure and electric, magnetic, and optical properties)

概要

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The ground-state phase diagram of alternating spin-1/2 chains with anisotropic ferromagnetic coupling under the influence of a symmetry-breaking transverse magnetic field is studied using 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_<c1> and h_<c2>, corresponding to the transition between different magnetic phases of the system. It is found that the intermediate state (h_<c1><h<h_<c2>) is gapful, and describes the stripe-antiferromagnetic phase.
社団法人日本物理学会の論文
2008-02-15