The Two-Dimensional<i>S</i>=1/2 Heisenberg Antiferromagnet on the<i>Shuriken</i>Lattice –A Lattice Composed of Vertex-Sharing Triangles–

Abstract

Using the numerical diagonalization method, we study the \(S=1/2\) Heisenberg antiferromagnet on a two-dimensional lattice composed of vertex-sharing triangles that we call the shuriken lattice. This lattice is similar to the kagome lattice but with a slight difference. We examine the ground-state properties and magnetization process of this model. We find that a magnetization jump appears at the higher-field-side edge of the magnetization plateau at one-third the height of saturation. A spin-flop phenomenon is clearly observed at the jump even when the system is isotropic in the spin space.