Numerical-Diagonalization Study of Magnetization Process of Frustrated Spin-1/2 Heisenberg Antiferromagnets in Two Dimensions: -Triangular- and Kagome-Lattice Antiferromagnets-

摘要

The S = 1/2 triangular - and kagome-lattice Heisenberg antiferromagnets are investigated under a magnetic field using the numerical-diagonalization method. A piocedure is proposed to extract data points with very small finite-size deviations using the numerical-diagonalization results tor capturing the magnetization curve. For the tnangulai-lattice antifenomagnet, the plateau edges at one-third the height of the saturation and the saturation field are successfully estimated. This study additionally presents results of magnetization process for a 45-site cluster of the kagome-lattice antiferromagnet; the present analysis suggests that the plateau does not open at one-ninth the height of the saturation.