Physics – Mathematical Physics
Scientific paper
1999-10-24
Physics
Mathematical Physics
11 pages, LaTeX 2e
Scientific paper
10.1016/S0378-4371(99)00521-X
We rigorously establish some exact properties of reflection symmetric spin systems with antiferromagnetic crossing bonds: At least one ground state has total spin zero and a positive semidefinite coefficient matrix. The crossing bonds obey an ice rule. This augments some previous results which were limited to bipartite spin systems and is of particular interest for frustrated spin systems.
Lieb Elliott H.
Schupp Peter
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