Mechanisms for Non-Trivial Magnetization Plateaux of an S=1 Frustrated Spin Ladder
Kiyomi Okamoto, Nobuhisa Okazaki, Tôru Sakai
Abstract
We investigate the non-trivial magnetization plateau at 1/4 of the saturation magnetization of S=1 spin ladder, especially with reference to recent experimental results on a new organic tetraradical 3,3',5,5'-tetrakis(N-tert-butylaminoxyl)biphenyl, abbreviated as BIP-TENO. We propose three mechanisms for the formation of the plateau; the Neel mechanism, the dimer mechanism and the spin-Peierls mechanism. We also discuss the effect of four-spin exchange interactions.
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