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首页> 外文期刊>Physical review >Long-range and short-range magnetic correlations, and microscopic origin of net magnetization in the spin-1 trimer chain compound CaNi_3P_4O_(14)
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Long-range and short-range magnetic correlations, and microscopic origin of net magnetization in the spin-1 trimer chain compound CaNi_3P_4O_(14)

机译：自旋1三聚体化合物CaNi_3P_4O_（14）的长程和短程磁相关性以及净磁化作用的微观起源

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摘要

Spin-spin correlations and microscopic origin of net magnetization in the spin-1 trimer chain compound CaNi_3P_4O_(14) have been investigated by powder neutron diffraction. The present study reveals a three-dimensional long-range magnetic ordering below 16 K where the magnetic structure consists of ferromagnetic trimers that are coupled ferromagnetically along the spin-chain direction (b axis). The moment components along the a and c axes arrange antiferromagnetically. Our study establishes that the uncompensated moment components along the b axis (m_b,) result in a net magnetization per unit cell. The magnetic structure, determined in the present study, is in agreement with the results of recent first-principles calculation; however, it is in contrast to a fascinating experimental prediction of ferrimagnetic ordering based on the periodicity of the exchange interactions in CaNi_3P_4O_(14). Our study also confirms the presence of broad diffuse magnetic scattering, due to one-dimensional short-range spin-spin correlations, over a wide temperature range below ～50 K down to a temperature well below the T_c. Total neutron scattering analysis by the reverse Monte Carlo (RMC) method reveals that the dominating spin-spin correlation above T_c is ferromagnetic and along the b axis. The nearest-neighbor spin-spin correlations along the a and c axes are found to be weakly antiferromagnetic. The nature of the trimer spin structure of the short-range ordered state (above T_c) is similar to that of the 3D long-range ordered state (below T_c). The present investigation of microscopic nature of the magnetic ground state also explains the condition required for the 1/3 magnetization plateau to be observed in the trimer spin chains. In spite of the S=1 trimer chain system, the present compound CaNi_3P_4O_(14) is found to be a good realization of a three-dimensional magnet below T_c = 16 K with full ordered moment values of ～2 μ_B/Ni~(2+) (1.98 and 1.96 μ_B/Ni~(2+) for two Ni sites, respectively) at 1.5 K.
机译：通过粉末中子衍射研究了自旋1三聚链化合物CaNi_3P_4O_（14）的自旋-自旋相关性和净磁化的微观起源。本研究揭示了在16 K以下的三维远距离磁阶，其中的磁性结构由铁磁三聚体组成，这些铁磁三聚体沿自旋链方向（b轴）铁磁耦合。沿a和c轴的力矩分量反铁磁排列。我们的研究建立了沿b轴的未补偿矩分量（m_b，）导致每单位晶胞的净磁化强度。在本研究中确定的磁结构与最近的第一性原理计算的结果相符。然而，这与基于CaNi_3P_4O_（14）中交换相互作用的周期性的铁磁有序的迷人实验预测相反。我们的研究还证实，由于一维短程自旋-自旋相关性，在约50 K以下的宽温度范围内直至远低于T_c的温度下，存在宽扩散磁散射。通过反向蒙特卡洛（RMC）方法进行的总中子散射分析表明，T_c以上的主要自旋-自旋相关性是铁磁的，并且沿b轴。发现沿a和c轴的最近邻居自旋-自旋相关性是弱反铁磁的。短程有序状态（高于T_c）的三聚体自旋结构的性质类似于3D远程有序状态（低于T_c）。目前对磁性基态的微观性质的研究还解释了在三聚体自旋链中观察到1/3磁化平稳所需的条件。尽管S = 1三聚体链系统，但发现本化合物CaNi_3P_4O_（14）是T_c = 16 K以下的三维磁体的良好实现，其全有序矩值为〜2μ_B/ Ni〜（2 +）（在1.5 K下分别为两个Ni位的1.98和1.96μB/ Ni〜（2+））。

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  • 来源
    《Physical review》 |2016年第18期|184409.1-184409.9|共9页
  • 作者

    A. K. Bera; S. M. Yusuf; Amit Kumar; M. Majumder; K. Ghoshray; L. Keller;

  • 作者单位

    Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India;

    Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India;

    Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India;

    Condensed Matter Physics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India,Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany;

    Condensed Matter Physics Division, Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India;

    Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland;

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