Progress of Theoretical Physics

Half Plateau Phase Diagram in Generalized Zig-Zag Spin Ladder (Field-Induced Phase Transitions and Dynamics in Quantum Spin Systems)

Akiyuki Tokuno, Kiyomi Okamoto, Takashi Tonegawa

Published Jan 1, 2005• 0 citations

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Half Plateau Phase Diagram in Generalized Zig-Zag Spin Ladder

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We study the finite-field ground state of an anisotropic S = 1/2 antiferromagnetic chain with bond-alternating nearest-neighbor and uniform next-nearest-neighbor interactions. The ground-state magnetization curve of this model has a plateau at a half of the saturation magnetization in a certain parameter region. We analytically investigate the plateau phase of this model by use of the degenerate perturbation theory up to the second order.

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