Heterobimetallic Dy-Cu coordination compound as a classical-quantum ferrimagnetic chain of regularly alternating Ising and Heisenberg spins

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:460

Article

Torrico, J.¹  Strecka, J.²  Hagiwara, M.³  Rojas, O.⁴  de Souza, S. M.⁴  Han, Y.⁵  Honda, Z.⁶  Lyra, M. L.¹ 

[1] Univ Fed Alagoas, Inst Fis, BR-57072970 Maceio, AL, Brazil

[2] Safarik Univ, Fac Sci, Inst Phys, Pk Angelinum 9, Kosice 04001, Slovakia

[3] Osaka Univ, Grad Sch Sci, Ctr Adv High Magnet Field Sci, 1-1 Machikaneyama, Toyonaka, Osaka 5600043, Japan

[4] Univ Fed Lavras, Dept Fis, BR-37200000 Lavras, MG, Brazil

[5] Huazhong Univ Sci & Technol, Wuhan Natl High Magnet Field Ctr, Wuhan 430074, Hubei, Peoples R China

[6] Saitama Univ, Grad Sch Sci & Engn, Sakura Ku, 255 Shimo Okubo, Saitama 3388570, Japan

关键词: Ising-Heisenberg chain;    Magnetization curves;    Heterobimetallic polymeric compound;    Powder averaging;   

DOI  :  10.1016/j.jmmm.2018.04.021

来源: Elsevier

【 摘 要 】

A classical-quantum chain composed of regularly alternating Ising and Heisenberg spins is rigorously solved by considering two distinct local anisotropy axes of the Ising spins. The ground-state phase diagram and magnetization curves are examined depending on a spatial orientation of the applied magnetic field. The phase diagram totally consists of four distinct phases and a few macroscopically degenerate points, where an outstanding coexistence of perfect order and complete disorder occurs within the socalled 'half-fire, half-ice' state. The zero-temperature magnetization curves generally exhibit a smooth dependence on a magnetic field owing to a canting angle between two coplanar anisotropy axes of the Ising spins, which enforces a misalignment of the magnetization vector from a direction of the applied magnetic field. It is evidenced that the investigated spin-chain model reproduces magnetic features of the heterobimetallic coordination compound Dy(NO)(3)(DMSO)(2)Cu(opba)(DMSO)(2) (DMSO = dimethylsulfoxide, opba = orthophenylenebisoxamato). The high-field magnetization data reported for the powder sample of this polymeric coordination compound generally display a substantial smoothing on account of a powder averaging. (C) 2018 Elsevier B.V. All rights reserved.

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