Small Antiferromagnetic Spin Systems: Just beyond the Rotational Band Model
W. Floreka and L.A. Kaliszan b
aAdam Mickiewicz University, Faculty of Physics, Umultowska 85, 61-614 Poznań, Poland
bPoznań School of Logistics, Estkowskiego 6, 61-755 Poznań, Poland
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Two systems of spins s=1/2 with the Heisenberg interactions are investigated: (i) an equilateral trapezoid and (ii) a regular hexagon. Both cases are compared with the corresponding sublattice Hamiltonians to determine splitting and mixing of energy levels with a given total spin of sublattices. It is shown that small modifications of the Hamiltonian parameters may significantly change (magnetic) properties of the eigenstates, especially probability of finding system in a state with determined value of the sublattice total spin.

DOI: 10.12693/APhysPolA.127.330
PACS numbers: 75.10.Jm, 75.50.Ee, 75.50.Xx