Frustrated spin model as a hard-sphere liquid.
We show that one-dimensional topological objects (kinks) are natural degrees of freedom for an antiferromagnetic Ising model on a triangular lattice. Its ground states and the coexistence of spin ordering with an extensive zero-temperature entropy can easily be understood in terms of kinks forming a hard-sphere liquid. Using this picture we explain effects of quantum spin dynamics on that frustrated model, which we also study numerically.
Mostovoy
M V
MV
Materials Science Center, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
Khomskii
D I
DI
Knoester
J
J
Prokof'ev
N V
NV