4.7 Article

Nature of Griffiths phase and ferromagnetic 3d-4f interaction in double-perovskite Dy2CoMnO6

期刊

JOURNAL OF ALLOYS AND COMPOUNDS
卷 893, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.162222

关键词

Dy2CoMnO6; Griffith phase; Ferromagnetism; Anti-site disorder; 3d-4f interaction

资金

  1. National Science Foundation of China [10874161]
  2. National Basic Research Program of China (973 Program) [2009CB939901]

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The structure and magnetic properties of double perovskite Dy2CoMnO6 (DCMO) were investigated, revealing the existence of a Griffiths phase which differs significantly from non-Griffiths phase behavior. The effects of A-site rare-earth ions on magnetism are dominated by radius, moments, and 3d-4f exchange interactions. FM/AFM coupling is related not only to the outer 4f electrons of rare earth ions, but also to inner orbital electrons.
Double perovskites Dy2CoMnO6 (DCMO) was synthesized by a sol-gel method and the structure and magnetic properties were systematically investigated. Both X-ray diffraction and Raman spectrum indicate that double pervoskite DCMO has a monoclinic structure with a space group P21/n. A Griffiths phase is confirmed to be existing in DCMO by the magnetic behaviors, which is significantly different from the behaviors of the non-Griffiths phase of Gd2CoMnO6 (GCMO) recently reported in reference. It is suggested that the origins of the different short-range magnetic orders of them can be attributed to the different 3d-4f exchange interactions in DCMO and GCMO, besides the effect of the unavoidable anti-site disorder, inter-rupting the long-range ferromagnetic (FM) order of Co2+-O-Mn4+, resulting in the formation of short-range FM order. The effects of A-site rare-earth Re3+ ions on the magnetism of double perovskite Re2Co(Ni)MnO6 are dominated by the combining and competing functions of the radius and the moments of rare earth ions (or the 3d-4f exchange interactions). The FM/AFM coupling is not only related to the most outer 4f electrons of the rare earth ions, but also to the inner 5d/6s orbital electrons. (C) 2021 Elsevier B.V. All rights reserved.

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