Abstract
Stability criterion for organic ferromagnetism is derived from crystal orbital method. For a given flat-band system, there exists a unique set of Wannier functions localized near each unit cell, which should be symmetric with respect to the lattice vector. The set of Wannier functions minimizes the exchange integral of the system within the freedom of degeneracy. When each Wannier function spans common atoms between the adjacent cells, the system becomes ferromagnetic. On the other hand, when each Wannier function spreads only at one unit cell, the system becomes antiferromagnetic. The proof of this rule is given by variational principle.
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Hatanaka, M. Stability criterion for organic ferromagnetism. Theor Chem Acc 129, 151–160 (2011). https://doi.org/10.1007/s00214-011-0923-y
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DOI: https://doi.org/10.1007/s00214-011-0923-y