Ground-state phase diagram and magnetization process of the exactly solved mixed spin-(1,1/2) Ising diamond chain

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:346

Article

Lisnyi, Bohdan^1,2  Strecka, Jozef¹ 

[1] Safarik Univ, Fac Sci, Dept Theoret Phys & Astrophys, Kosice 04001, Slovakia

[2] Natl Acad Sci Ukraine, Inst Condensed Matter Phys, UA-79011 Lvov, Ukraine

关键词: Ising model;    Diamond chain;    Spin frustration;    Magnetization plateau;   

DOI  :  10.1016/j.jmmm.2013.07.009

来源: Elsevier

【 摘 要 】

The ground state and magnetization process of the mixed spin-(1,1/2) Ising diamond chain are exactly solved by employing the generalized decoration-iteration mapping transformation and the transfer-matrix method. The decoration-iteration transformation is first used in order to establish a rigorous mapping equivalence with the corresponding spin-1 Blume-Emery-Griffiths chain in a non-zero magnetic field, which is subsequently exactly treated within the framework of the transfer-matrix technique. It is shown that the ground-state phase diagram includes just four different ground states and the low-temperature magnetization curve may exhibit an intermediate plateau precisely at one half of the saturation magnetization. Our rigorous results disprove recent Monte Carlo simulations of Xin et al. [Z. Xin, S. Chen, C. Zhang, J. Magn. Magn. Mater. 324 (2012) 3704], which imply an existence of the other magnetization plateaus at 0.283 and 0426 of the saturation magnetization. (C) 2013 Elsevier B.V. All rights reserved

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