Half Plateau Phase Diagram in Generalized Zig-Zag Spin Ladder
Akiyuki Tokuno, Kiyomi Okamoto, Takashi Tonegawa
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.
Progress of Theoretical Physics Supplement•Jan 1, 2005•1 citation