论文标题
2D蜂窝层的磁性Na2ni2Teo6复合由中间Na层晶体结构驱动
Magnetism of the 2D honeycomb layered Na2Ni2TeO6 compound driven by intermediate Na-layer crystal-structure
论文作者
论文摘要
已经通过中子衍射和非弹性中子散射研究了2D层的自旋1蜂窝晶状体Na2ni2Teo6中的微观自旋旋转相关性Na2ni2Teo6。 Spin-1 Ni2+离子的蜂窝晶格在晶体学AB平面内通过中间Na层很好地沿C轴分离，其晶体结构包含Na离子的手性核密度分布。交替的NA层的手性相反。这种NA层的交替手性决定了沿C轴的磁性周期性，在C轴上发现了向上向下向下旋转的自旋排列。 Besides, the above described commensurate (CM) zigzag AFM order state is found to coexist with an incommensurate (ICM) AFM state below the TN ~ 27.5 K. The ICM state is found to appear at much higher temperature ~ 50 K and persists down to lowest measured temperature of 1.7 K. Our reverse Monte Carlo (RMC) analysis divulges a two dimensional (2D) magnetic correlations (within the ab plane) of在整个温度范围内的ICM AFM状态1.7-50K。此外，自旋 - 汉顿量是通过进行无弹性中子散射实验和随后的线性自旋波理论分析来确定的，该实验揭示了与Zigzag afm基地状态和虚弱的单个互动互动的竞争之间的竞争之间的交换相互作用，最多3 rd的邻居与弱小的互动互动差。交换常数的值使Na2ni2Teo6在理论相图中很好地位于曲折的AFM相位（跨越J2/J1和J3/J1值的宽范围）内。因此，本研究提供了对磁相关性的详细理解，并泄露了交织的磁结构相关性。
The microscopic spin-spin correlations in the 2D layered spin-1 honeycomb lattice compound Na2Ni2TeO6 have been investigated by neutron diffraction and inelastic neutron scattering. The honeycomb lattice of spin-1 Ni2+ ions, within the crystallographic ab planes, are well separated along the c axis by an intermediate Na layer whose crystal structure contains chiral nuclear density distributions of Na ions. The chirality of the alternating Na layers is opposite. Such alternating chirality of the Na layer dictates the magnetic periodicity along the c axis where an up-up-down-down spin arrangement of the in-plane zigzag AFM structure is found. Besides, the above described commensurate (CM) zigzag AFM order state is found to coexist with an incommensurate (ICM) AFM state below the TN ~ 27.5 K. The ICM state is found to appear at much higher temperature ~ 50 K and persists down to lowest measured temperature of 1.7 K. Our reverse Monte Carlo (RMC) analysis divulges a two dimensional (2D) magnetic correlations (within the ab plane) of the ICM AFM state over the entire temperature range 1.7-50 K. Further, the spin-Hamiltonian has been determined by carrying out inelastic neutron scattering experiments and subsequent linear spin-wave theory analysis which reveals the presence of competing inplane exchange interactions up to 3 rd nearest neighbours consistent with the zigzag AFM ground state, and weak interplanar interaction as well as a weak single-ion-anisotropy. The values of the exchange constants yield that Na2Ni2TeO6 is situated well inside the zigzag AFM phase (spans over a wide ranges of J2/J1 and J3/J1 values) in the theoretical phase diagram. The present study, thus, provides a detailed microscopic understanding of the magnetic correlations and divulges the intertwining magneto-structural correlations.
