Magnetic Structure of the Two-Dimensional Antiferromagnet BaCo F 4
Magnetic Structure of the Two-Dimensional Antiferromagnet BaCo F 4
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DOI：
10.1103/physrevb.6.2677
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发表时间：
1972-10
影响因子：
3.7
通讯作者：
M. Eibschütz;L. Holmes;H. Guggenheim;D. Cox
中科院分区：
文献类型：
--
作者：
M. Eibschütz;L. Holmes;H. Guggenheim;D. Cox
BaCo${\mathrm{F}}_{4}$ 的磁化率和中子衍射测量结果显示了二维反铁磁体的行为特征。该材料具有高度各向异性，并表现出两个磁相 $A$ 和 $B$，这两个磁相在相同温度下在三个维度上有序，${T}_{N}=(69.6\ifmmode\pm\else\textpm\fi{}0.1)\ifmmode^\circ\else\text Degree\fi{}$K。磁性结构由褶皱 (010) 磁矩层组成，其中最近的邻居反平行耦合。在 $b$ 方向上相距 14 \AA{} 的力矩的顺序在 $A$ 相中是反平行的，而在 $B$ 相中是平行的。力矩沿着 [100] 方向。如果假定两个相位的 ${\mathrm{Co}}^{2+}$ 矩相同，则有序矩的大小为 $(3.4\ifmmode\pm\else\textpm\fi{}0.2){\ensuremath{\mu}}_{B}$，在 4.7 \ifmmode^\circ\else\text Degree\fi{}K 处。
The results of magnetic-susceptibility and neutron-diffraction measurements on BaCo${\mathrm{F}}_{4}$ show behavior characteristic of a two-dimensional antiferromagnet. The material is highly anisotropic and exhibits two magnetic phases, $A$ and $B$, both of which order in three dimensions at the same temperature, ${T}_{N}=(69.6\ifmmode\pm\else\textpm\fi{}0.1)\ifmmode^\circ\else\textdegree\fi{}$K. The magnetic structure consists of puckered (010) layers of moments within which nearest neighbors are coupled antiparallel. The ordering of the moments 14 \AA{} apart in the $b$ direction is antiparallel in phase $A$ and parallel in phase $B$. The moments are directed along [100]. If the ${\mathrm{Co}}^{2+}$ moment is assumed to be the same for both phases, then the ordered moments have a magnitude of $(3.4\ifmmode\pm\else\textpm\fi{}0.2){\ensuremath{\mu}}_{B}$ at 4.7 \ifmmode^\circ\else\textdegree\fi{}K.