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cond-mat1995
Splitting the multiphase point
J. M. Yeomans
Models with competing interactions, for example the ANNNI model, can have special points at which the ground state is infinitely degenerate, so-called multiphase points. Small pert…
cond-mat1994
Quantum Fluctuations in the Annni Model
A. B. Harris, C. Micheletti, J. M. Yeomans
We obtain the ANNNI model from a Heisenberg model with large single--ion anisotropy energy, , as might be relevant for helical spin systems. We treat quantum fluctuations to low…