Magnetization plateau in the S=1 spin ladder with competing interactions

Abstract

Very recently, a non-trivial magnetization plateau at 1/4 of the saturation magnetization was observed in the S=1 spin ladder 3,3′,5,5′-tetrakis( N- tert-butylaminoxyl)biphenyl. In our previous work, we proposed a possible mechanism of the plateau based on the second- and third-neighbor exchange couplings, which lead to frustration. In order to confirm the realization of the mechanism, we compare the temperature dependence of the magnetic susceptibility and some critical magnetic fields obtained by the numerical calculation for the proposed model with the experimental results.