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Critical magnetization behavior of the triangular- and kagome-lattice quantum antiferromagnets

2011; American Physical Society; Volume: 83; Issue: 10 Linguagem: Inglês

10.1103/physrevb.83.100405

1550-235X

Tôru Sakai, Hiroki Nakano,

Organic and Molecular Conductors Research

We investigate the $S=1/2$ quantum spin antiferromagnets on the triangular and Kagome lattices in magnetic field, using the numerical exact diagonalization. Particularly we focus on an anomalous magnetization behavior of each system at 1/3 of the saturation magnetization. The critical exponent analyses suggest that it is a conventional magnetization plateau on the triangular lattice, while an unconventional phenomenon, called the magnetization ramp, on the Kagome lattice.