Magnetization Plateau of an S=1 Frustrated Spin Ladder
  We study the magnetization plateau at 1/4 of the saturation magnetization of the S=1 antiferromagnetic spin ladder both analytically and numerically, with the aim of explaining recent experimental results on BIP-TENO by Goto et al. We propose two mechanisms for the plateau formation and clarify the plateau phase diagram on the plane of the coupling constants between spins. 
Kiyomi Okamoto, Nobuhisa Okazaki and T\^oru Sakai