Spin-1 Heisenberg antiferromagnetic chain with exchange and
Peters, D., McCulloch, I.P.(2), Selke, W.
Institut für Theoretische Physik, Technische Hochschule Aachen,
D-52056 Aachen, Germany and (2) Department of Physics, University of Queensland,
Brisbane, QLD 4072, Australia
Using density matrix renormalization group calculations, ground state
properties of the spin-1 Heisenberg chain with exchange and
single--ion anisotropies in an external field are studied. Our
findings confirm and refine recent results by Sengupta and
Batista, Physical Review Letters 98, 227201 (2007), on the same
model applying Monte Carlo techniques. In particular, we present
evidence for two types of biconical (or supersolid) and for
two types of spin--flop (or superfluid) structures. Basic
features of the quantum phase diagram may be interpreted qualitatively in
the framework of classical spin models.