For a ring of classical spins with one antiferromagnetic bond, the ground state switches from collinear to coplanar at an analytically known critical coupling, and the full phase diagram is classified.
Phase diagram of an N = 6 polygon with FM bonds given by (75)
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Ground states of classical spin polygons: Rigorous results and examples
For a ring of classical spins with one antiferromagnetic bond, the ground state switches from collinear to coplanar at an analytically known critical coupling, and the full phase diagram is classified.