Magnetization Curves of Antiferromagnetic Heisenberg Spin-1/2 Ladders
D. C. Cabra, A. Honecker, P. Pujol
Abstract
Magnetization processes of spin-1/2 Heisenberg ladders are studied using strong-coupling expansions, numerical diagonalization of finite systems and a bosonization approach. We find that the magnetization exhibits plateaux as a function of the applied field at certain rational fractions of the saturation value. Our main focus are ladders with 3 legs where plateaux with magnetization one third of the saturation value are shown to exist.
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