Magnetization plateaus of SrCu_2(BO_3)_2 from a Chern-Simons theory

Details Magnetization plateaus of SrCu_2(BO_3)_2 from a Chern-Simons theory Magnetization plateaus of SrCu_2(BO_3)_2 from a Chern-Simons theory

2001-02-21

arxiv.org/abs/cond-mat/0102377v1

Phys. Rev. Lett. 87, 097203 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.87.097203

The antiferromagnetic Heisenberg model on the frustrated Shastry-Sutherland lattice is studied by a mapping onto spinless fermions carrying one quantum of statistical flux. Using a mean-field approximation these fermions populate the bands of a generalized Hofstadter problem. Their filling leads to the magnetization curve. For SrCu_2(BO_3)_2 we reproduce plateaus at 1/3 and 1/4 of the saturation moment and predict a new one at 1/2. Gaussian fluctuations are shown to be massive at these plateau values.

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