Magnetization plateaus as insulator-superfluid transitions in quantum spin systems

Details Magnetization plateaus as insulator-superfluid transitions in quantum spin systems Magnetization plateaus as insulator-superfluid transitions in quantum spin systems

1999-10-05

arxiv.org/abs/cond-mat/9910057v2

Phys. Rev. B 61, 3231 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, RevTeX, 7 figures, note and reference added

Scientific paper

10.1103/PhysRevB.61.3231

We study the magnetization process in two-dimensional S=1/2 spin systems, to discuss the appearance of a plateau structure. The following three cases are considered: (1) the Heisenberg antiferromagnet and multiple-spin exchange model on the triangular lattice, (2) Shastry-Sutherland type lattice, [which is a possible model for SrCu2(BO3)2,] (3) 1/5-depleted lattice (for CaV4O9). We find in these systems that magnetization plateaus can appear owing to a transition from superfluid to a Mott insulator of magnetic excitations. The plateau states have CDW order of the excitations. The magnetizations of the plateaus depend on components of the magnetic excitations, range of the repulsive interaction, and the geometry of the lattice.

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