Phase diagram and magnetization structures of spin-3/2 bond-alternating Ising chains with single-ion anisotropy

By the infinite time-evolving block decimation (iTEBD) algorithm, the magnetization process of the spin 3 bond-alternating Ising chain with single-ion anisotropy (D) is investigated. Magnetization plateaus including detailed magnetization structures of three different cases are uncovered, and three rich ground-state phase diagrams are explicitly determined. Especially, for the uniform antiferromagnetic case, a phase transition line at D=J, which divides the M-z=0 (M-z=1/2) plateau into two phases, are detected by the magnetization structure and the ground-state energy, and a updated phase diagram is proposed. Such a transition line was not recognized by the average magnetization previously. A same transition line (D=J) is also detected in the phase diagram of the antiferromagnetic-ferromagnetic alternating case. Magnetization plateaus are found to be easily induced for the classical Ising systems without quantum fluctuations, and the single-ion anisotropy plays a key role in the formation of M-z = 1/2 and 1 plateaus in the present model. (C) 2015 Elsevier Ltd. All rights reserved.