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Dimensional crossover in Cr-doped Co_3BO_5

机译：CR-掺杂CO_3BO_5中的尺寸交叉

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摘要

The crystal structure and the magnetic properties of the Co_(2.5)Cr_(0.5)BO_5 ludwigite have been investigated by x-ray diffraction, magnetization, and specific heat experiments. Cr ions mainly occupy sites 4 of the ludwigite lattice, substituting approximately half of the Co~(3+). It changes the interatomic distances and favors a high spin state for the remaining Co~(1+) ions. Doping the homometallic CO_3BO_5 with magnetic Cr drastically increases the magnetic transition temperature from 42 K, for the undoped compound, to 76 K for Co_(2.5)Cr_(0.5)BO_5. The latter contains three different magnetic ions, Co~(2+), Co~(3+) and Cr~(3+) in high spin states, as evidenced by magnetization measurements. The specific position of Cr in the structure (sites 4) gives rise, according to calculations of the exchange interactions and the Goodenough-Kanamori rules, to a few frustrated magnetic interactions. This is responsible for the high ferrimagnetic ordering temperature of 76 K, when compared to that of the pure compound. The experimental results imply a magnetic structure for the system that we show is consistent with the known interactions and the Goodenough-Kanamori rules. Low temperature specific heat and magnetization measurements reveal that the two-dimensional nature of the magnetism CO_3BO_5 when doped with Cr acquires a three-dimensional character with a high temperature ferrimagnetic order.
机译：通过X射线衍射，磁化和特定的热实验研究了CO_（2.5）CR_（0.5）CR_（0.5）CR_（0.5）BO_5 Ludwigite的晶体结构和磁性。 Cr离子主要占据Ludwite格子的遗址4，用大约一半的CO〜（3+）。它改变了间隙距离，并有利于剩余的CO〜（1+）离子的高旋转状态。用磁CR掺杂均衡的CO_3BO_5大大增加了42 k的磁性转变温度，对于未掺杂的化合物，对于CO_（2.5）CR_（0.5）BO_5的76k。后者在高旋转状态下含有三种不同的磁离子，CO〜（2+），CO〜（3+）和Cr〜（3+），如磁化测量所证明。根据交换相互作用的计算和良好的磁相互作用，根据结构（部位4）中Cr的特定位置给出了一些挫折的磁相互作用。与纯化合物相比，这对高铁磁性排序温度负责76 k。实验结果意味着我们展示的系统磁性结构与已知的相互作用和良品 - Kanamori规则一致。低温比热和磁化测量揭示了磁共辛CO_3BO_5当掺杂CR时的二维性质获取具有高温铁磁磁性的三维特征。

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  • 来源
    《Physical review》 |2020年第6期|064424.1-064424.10|共10页
  • 作者

    D. L. Mariano; M. A. V. Heringer; D. C. Freitas; E. Baggio-Saitovitch; M. A. Continentino; E. C. Passamani; D. R. Sanchez;

  • 作者单位

    Instituto de Fisica Universidade Federal Fluminense Campus da Praia Vermelha 24210-340 Niteroi Rio de Janeiro Brazil;

    Instituto de Fisica Universidade Federal Fluminense Campus da Praia Vermelha 24210-340 Niteroi Rio de Janeiro Brazil;

    Instituto de Fisica Universidade Federal Fluminense Campus da Praia Vermelha 24210-340 Niteroi Rio de Janeiro Brazil;

    Centro Brasileiro de Pesquisas Fisicas Rua Doutor Xavier Sigaud 150-Urca 22290-180 Rio de Janeiro Rio de Janeiro Brazil;

    Centro Brasileiro de Pesquisas Fisicas Rua Doutor Xavier Sigaud 150-Urca 22290-180 Rio de Janeiro Rio de Janeiro Brazil;

    Departamento de Fisica Universidade Federal do Espirito Santo Avenida Fernando Ferrari 514-Goiabeiras 29075-010 Vitoria Espirito Santo Brazil;

    Instituto de Fisica Universidade Federal Fluminense Campus da Praia Vermelha 24210-340 Niteroi Rio de Janeiro Brazil;

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