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Lattice dynamical properties of antiferromagnetic MnO, CoO, and NiO, and the lattice thermal conductivity of NiO

机译:反铁磁MnO,COO和NIO的晶格动力学特性,以及NIO的晶格导热系数

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摘要

Lattice dynamical properties of antiferromagnetic rocksalt oxides are often interpreted using the cubic space group Fm (3) over barm, although below Neel temperature their magnetic substructure possesses a lower symmetry. For example, in the case of NiO, a rhombohedral structural distortion lowers the symmetry to trigonal space group R (3) over barm below 525 K. We performed hybrid density functional theory calculations on the phonon dispersion relations of MnO, CoO, and NiO, and the lattice thermal conductivity of NiO using both Fm (3) over barm and R (3) over barm space groups. The calculated acoustic phonon frequencies of all oxides agree well with the available experimental data, while the optical modes of MnO and CoO show somewhat larger discrepancies. Our calculations show the phonon density of states to be very similar with both studied space groups. The experimental thermal conductivity of antiferromagnetic NiO is reproduced well below the Neel temperature by solving the linearized phonon Boltzmann transport equation.
机译:晶格摩托型旋转氧化物的动力学性能通常在BARM上使用立方空间组FM(3)来解释,尽管下面的NEER温度它们的磁性子结构具有较低的对称性。例如,在NIO的情况下,rhombohedral结构失真将对称性降低到低于525k的BARM上的对称性。我们对MNO,COO和NIO的声音分散关系进行了混合密度函数理论计算,和在BARM空间群上使用FM(3)的FM(3)使用FM(3)的NIO的晶格热导率。所有氧化物的计算的声学声子频率与可用的实验数据很好,而MNO和COO的光学模式显示出稍微较大的差异。我们的计算显示状态的声子密度与研究的空间组非常相似。通过求解线性化的声音型螺栓玻璃传送方程,通过求解反铁磁NIO的实验导热性。

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  • 来源
    《Physical review》 |2019年第14期|144307.1-144307.9|共9页
  • 作者单位

    Aalto Univ Dept Chem & Mat Sci POB 16100 FI-00076 Aalto Finland;

    Aalto Univ Dept Chem & Mat Sci POB 16100 FI-00076 Aalto Finland;

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