One-Third Magnetization Plateau in an Anisotropic (S,S') = (1,2) Spin-Alternating Chain(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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Employing numerical methods, we study the ground-state magnetization curve of a (S,S') = (1,2) spin-alternating chain with uniaxial single-ion anisotropies, where S = 1 and S' = 2 spins are alternating and coupled antiferromagnetically. Special attention is paid to the magnetization plateau, the one-third plateau, which appears at one third of the saturation magnetization in the ground-state magnetization curve. We find that three kinds of one-third plateaux appear, one of which has a quantum nature, while the remaining two have a classical (Ising) nature. We determine the one-third plateau phase diagram on the D_2 versus D_1 plane, where D_1 (D_2) is the ratio of the single-ion anisotropy constant for the S = 1 (S' = 2) spin to the exchange interaction constant. This phase diagram consists of a phase boundary line between the quantum and classical one-third plateau states as well as three phase boundary lines between the one-third plateau and plateauless states. We emphasize that there is no phase transition between two classical one-third plateau states and both states are regarded as a single phase. Furthermore, the region of the one-third plateauless phase is divided into two parts, that is, the region in which the one-third magnetization state is not realized at any magnetic field as the ground state, and the region in which it is realized but no one-third plateau appears in the ground-state magnetization curve.
社団法人日本物理学会の論文
2007-12-15

One-Third Magnetization Plateau in an Anisotropic (S,S') = (1,2) Spin-Alternating Chain(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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