Magnetization plateaus in weakly coupled dimer spin system

Details Magnetization plateaus in weakly coupled dimer spin system Magnetization plateaus in weakly coupled dimer spin system

1998-06-24

arxiv.org/abs/cond-mat/9806292v3

Phys. Rev. B. vol. 59 (1999) 4181-88

Physics

Condensed Matter

Strongly Correlated Electrons

serious changes in Sect. II,III, final version to appear in PRB

Scientific paper

10.1103/PhysRevB.59.4181

I study a spin system consisting of strongly coupled dimers which are in turn weakly coupled in a plane by zigzag interactions. The model can be viewed as the strong-coupling limit of a two-dimensional zigzag chain structure typical, e.g., for the $(ac)$-planes of KCuCl_3. It is shown that the magnetization curve in this model has plateaus at 1/3 and 2/3 of the saturation magnetization, and an additional plateau at 1/2 can appear in a certain range of the model parameters; the critical fields are calculated perturbatively. It is argued that for the three-dimensional lattice structure of the KCuCl_3 family the plateaus at 1/4 and 3/4 of the saturation can be favored in a similar way, which might be relevant to the recent experiments on NH_4CuCl_3 by Shiramura et al., J. Phys. Soc. Jpn. {\bf 67}, 1548 (1998).

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