Quantum Effect on the Ground State of the Triple-Perovskite Ba 3 MNb 2 O 9 (M = Co, Ni, and Mn) with Triangular-Lattice
Quantum Effect on the Ground State of the Triple-Perovskite Ba 3 MNb 2 O 9 (M = Co, Ni, and Mn) with Triangular-Lattice
复制标题
三角晶格三重钙钛矿 Ba 3 MNb 2 O 9 (M = Co、Ni 和 Mn) 基态的量子效应
DOI：
10.1021/acs.chemmater.2c01576
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发表时间：
2022
影响因子：
8.6
通讯作者：
Matsuda, M.
中科院分区：
文献类型：
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作者：
Jiao, Jinlong;Zhang, Shangshun;Huang, Qing;Zhang, M.;Shu, M.F.;Lin, G. T.;dela Cruz, C. R.;Garlea, V. O.;Butch, N.;Matsuda, M.
作为几何挫败的最简单的例子，二维三角晶格反铁磁体表现出晶格几何形状和自旋交换相互作用之间的不匹配，由于其奇特的量子现象而成为深入研究的主题。在这里，我们通过中子粉末衍射和非弹性中子散射测量对具有三角形晶格几何形状的三钙钛矿氧化物 Ba3MNb2O9（M = Co、Ni 和 Mn）进行了磁结构和自旋波激发的详细研究。受挫相互作用和易平面/轴各向异性之间的相互作用导致 Ba3CoNb2O9(Ba3MnNb2O9) 产生两个磁相变温度，而 Ba3NiNb2O9 则仅产生一个。线性自旋波理论+1/S计算表明，空间维度和自旋尺寸对量子涨落的强度都有显着影响，从而导致它们不同的磁基态和奇异的物理性质。此外，还介绍了 Ba3NiNb2O9 的热波动的影响。
As the simplest example of geometrical frustration, the two-dimensional triangular lattice antiferromagnet exhibits the mismatch between the lattice geometry and spin-exchange interaction, which has been the subject of intensive studies due to its exotic quantum phenomena. Here, we performed detailed studies of the magnetic structures and spin wave excitations by neutron powder diffraction and inelastic neutron scattering measurements on the triple-perovskite oxides Ba3MNb2O9(M = Co, Ni, and Mn) with triangular-lattice geometry. The interplay between the frustrated interaction and easy-plane/axis anisotropy gives rise to two magnetic phase transition temperatures for Ba3CoNb2O9(Ba3MnNb2O9) and only one for Ba3NiNb2O9. The linear spin-wave theory +1/Scalculations indicate that both spatial dimensionality and the spin size have a significant impact on the strength of quantum fluctuations, which lead to their different magnetic ground states and exotic physical properties. Moreover, the effects of the thermal fluctuations are presented for Ba3NiNb2O9.