Ground-state phase diagram of the spin-1/2 ferromagnetic-antiferromagnetic alternating Heisenberg chain with anisotropy.
The ground state of the ferromagnetic-antiferromagnetic alternating spin-t Heisenberg chain is stud ied with Ising-type anisotropy on the ferromagnetic bond. This model tends to the spin-l antiferromag netic Heisenberg chain with on-site anisotropy in the limit of strong ferromagnetic bond. It is found that the Halda...