Abstract
The magnetization process of the kagome-lattice antiferromagnet is investigated by numerical diagonalization and the finite-size scaling analysis, as well as the triangular-lattice one. Our previous numerical diagonalization study revealed that the kagome-lattice system exhibits a new field-induced phenomenon, called a magnetization ramp, at 1/3 of the saturation magnetization, while the triangular one a conventional magnetization plateau. In order to clarify the difference between the magnetization ramp and plateau, we consider a generalized lattice model with two exchange interactions J1 and J2, which corresponds to the kagome lattice for J2=0 and triangular one for J2 = J1.
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