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We study the breakdown of the magnetization plateau at the magnetizationM=M_{S}/3 (M_{S} is the saturation magnetization) of the S=1/2 anisotropic spinchain with ferromagnetic-ferromagnetic-antiferromagnetic interactions. Weconsider the model with the isotropic ferromagnetic (trimer) coupling J_{F},and anisotropic antiferromagnetic coupling (J_{x}=J_{y}=J_{AF} and J_{z}=\DeltaJ_{AF}). For the limit of large \gamma\equiv J_{F}/J_{AF}, the model isequivalent to the S=3/2 XXZ chain with the exchange anisotropy \Delta. There isa phase transition between the plateau (small-\gamma) and the no-plateau(large-\gamma) regions. This phase transition is of theBerezinskii-Kosterlitz-Thouless type, and we determine the phase boundary fromthe numerical diagonalization data. For \Delta=1, in particular, the phasetransition between the plateau and the no-plateau regions occurs at the point\gamma_{c}=15.4.Comment: 10 pages, 5 figure

Breakdown of the magnetization plateau of theS= 1/2 ferromagnetic-ferromagnetic-antiferromagnetic trimerized spin chain with anisotropy