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Magnetism and charge ordering in high- and low-temperature phases of Nb_2O_2F_3

机译:Nb_2O_2F_3的高温和低温阶段的磁性和电荷有序

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摘要

It is shown using ab initio band structure calculations that Nb_2O_2F_3 is in the orbital-selective regime in the high-temperature phase (T > 90 K), when two electrons occupy singlet molecular orbital, while the magnetic response comes from the remaining single electron in Nb_2~(3.5+) dimer. The charge order occurs at low temperatures, resulting in the formation of Nb~(3+)-Nb~(3+) and Nb~(4+)-Nb~(4+) dimers, which makes this system nonmagnetic The single electron with unpaired spin is transferred to Nb~(3+)-Nb~(3+) dimer, but due to a strong splitting of the bonding xz/yz molecular orbitals the low-spin state with S=0 is stabilized. We argue that the mechanism of the charge ordering in Nb_2O_2F_3 is the gain in kinetic energy related to the formation of molecular orbitals, which occurs due to a strong nonlinear distance dependence of the hopping parameters.
机译:使用从头算带结构计算表明,当两个电子占据单重态分子轨道时,Nb_2O_2F_3处于高温阶段(T> 90 K)处于轨道选择状态,而磁响应则来自于剩余的单电子。 Nb_2〜(3.5+)二聚体。电荷序在低温下发生,导致形成Nb〜(3 +)-Nb〜(3+)和Nb〜(4 +)-Nb〜(4+)二聚体,从而使该系统无磁性。具有不成对自旋的分子被转移到Nb〜(3 +)-Nb〜(3+)二聚体,但是由于键合xz / yz分子轨道的强烈分裂,S = 0的低自旋态得以稳定。我们认为,Nb_2O_2F_3中电荷有序的机制是与分子轨道形成有关的动能增益,这是由于跳跃参数对非线性距离的强烈依赖而发生的。

著录项

  • 来源
    《Journal of magnetism and magnetic materials》 |2016年第12期|28-32|共5页
  • 作者单位

    M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620137 Yekaterinburg, Russia;

    Ⅱ. Physikalisches Institut, Universitaet zu Koeln, Zuepicher Strasse 77, D-50937 Koeln, Germany;

    M.N. Miheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences, 620137 Yekaterinburg, Russia,Ural Federal University, 620002 Yekaterinburg, Russia;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Dimers; Charge ordering;

    机译:二聚体;收费订购;

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