Thermal evolution of quasi-one-dimensional spin correlations within the anisotropic triangular lattice of α - NaMnO 2 .
Thermal evolution of quasi-one-dimensional spin correlations within the anisotropic triangular lattice of α - NaMnO 2 .
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α-NaMnO 2 各向异性三角晶格内准一维自旋关联的热演化。
DOI：
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发表时间：
2018
影响因子：
3.7
通讯作者：
Stephen D. Wilson
中科院分区：
文献类型：
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作者：
R. Dally;R. Chisnell;L. Harriger;Yaohua Liu;J. Lynn;Stephen D. Wilson
用中子衍射测量方法研究了α - NaMnO 2空间各向异性三角晶格的磁序.在T N = 22 K以下，发现到一个k =（0.5，0.5，0）的相称的共线反铁磁基态的跃迁发生.在此温度以上，过渡之前形成的共存，短程有序，不相称的状态低于T IC = 45 K，其二维传播矢量演变为K =（0.5，0.5）的温度接近TN。在高温（T > T IC），准弹性散射揭示了一维自旋相关沿着最近邻Mn-Mn“链方向”的MnO 6平面。我们的数据与各向异性三角形晶格上的伊辛类自旋的平均场模型的预测一致，以及针对这种材料报道的主要是一维海森堡自旋哈密顿量。
Magnetic order on the spatially anisotropic triangular lattice of α - NaMnO 2 is studied via neutron diffraction measurements. The transition into a commensurate, collinear antiferromagnetic ground state with k = ( 0.5 , 0.5 , 0 ) was found to occur below T N = 22 K . Above this temperature, the transition is preceded by the formation of a coexisting, short-range ordered, incommensurate state below T IC = 45 K whose two-dimensional propagation vector evolves toward k = ( 0.5 , 0.5 ) as the temperature approaches T N . At high temperatures ( T > T IC ) , quasielastic scattering reveals one-dimensional spin correlations along the nearest-neighbor Mn-Mn "chain direction" of the MnO6 planes. Our data are consistent with the predictions of a mean-field model of Ising-like spins on an anisotropic triangular lattice, as well as the predominantly one-dimensional Heisenberg spin Hamiltonian reported for this material.
影响因子：
16.6
作者：
Ovsyannikov, Sergey V.;Abakumov, Artem M.;Dubrovinsky, Leonid
通讯作者：
Dubrovinsky, Leonid