Magnetization plateau in the spin ladder with the four-spin exchange

Abstract

The magnetization process of the $S$=1/2 antiferromagnetic spin ladder with the four-spin cyclic exchange interaction at T=0 is studied by the exact diagonalization of finite clusters and size scaling analyses. It is found that a magnetization plateau appears at half the saturation value if the ratio of the four- and two-spin exchange coupling constants $J_4$ is larger than the critical value $J_{4c}=0.05\pm$0.04. The phase transition with respect to $J_4$ at $J_{4c}$ is revealed to be the Kosterlitz-Thouless-type.

4 pages, Revtex, with 5 eps figures

References in corpus (4)

• Spin Liquid in the Multiple-Spin Exchange model on the Triangular lattice: 3He on graphite
• Ladders in a magnetic field: a strong coupling approach
• Magnetization plateau in S=3/2 antiferromagnetic Heisenberg chain with anisotropy
• Ground State of a Spin System with Two- and Four-spin Exchange Interactions on the Triangular Lattice

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