论文标题
对比srlacusbo $ _ {6} $和srlacunbo $ _ {6} $的磁性结构：spin-1/2 quasi-square-lattice $ j_1 { - } j_2 $ heisenberg antiferromagnets
Contrasting Magnetic Structures in SrLaCuSbO$_{6}$ and SrLaCuNbO$_{6}$: Spin-1/2 Quasi-Square-Lattice $J_1 {-} J_2$ Heisenberg Antiferromagnets
论文作者
论文摘要
我们报告了双骨kites srlacusbo $ _6 $（SLCSO）和Srlacunbo $ _6 $（SLCNO）的磁性特性。两种化合物的磁敏感性的温度依赖性都显示出$ s \，= \，1/2 $方形晶格Heisenberg Antiferromagnet的广泛最大特征。磁性排序分别为$ t _ {\ rm n} \，{=} \，Slcso和Slcno分别为13.6 $和15.7 K。中子粉末衍射测量结果揭示了两种化合物中的对比旋转结构。 SLCSO和SLCNO的旋转结构分别是NéelAntyelantanéelAntyantagnetic和collinear抗fiferromagnetic。该结果表明，最近的邻居相互作用在SLCSO中占主导地位，而下一新的邻居相互作用在SLCNO中占主导地位。在3.5 K处评估了有序力矩的幅度为$ m \，{=} \，0.39（3）\，SLCSO的μ_{\ rm B} $的SLCSO和$ 0.37（1）\，μ_{\μ_{\ rm B} $用于SLCNO的较小较小的slcno，该slcno的较小较小的是使用较小的slcno have prodim lineal prination prination lineal spine spine spine。我们推断，小排序的力矩是由SR和LA离子的位点障碍引起的交换键随机性引起的。
We report the magnetic properties of the double perovskites SrLaCuSbO$_6$ (SLCSO) and SrLaCuNbO$_6$ (SLCNO). The temperature dependence of the magnetic susceptibilities of both compounds shows a broad maximum characteristic of an $S\,=\,1/2$ square lattice Heisenberg antiferromagnet. Magnetic ordering occurs at $T_{\rm N}\,{=}\,13.6$ and 15.7 K for SLCSO and SLCNO, respectively. Neutron powder diffraction measurements reveal contrasting spin structures in both compounds. The spin structures of SLCSO and SLCNO below $T_{\rm N}$ are Néel antiferromagnetic and collinear antiferromagnetic, respectively. This result demonstrates that the nearest-neighbor interaction is dominant in SLCSO, whereas the next-nearest-neighbor interaction is dominant in SLCNO. The magnitude of the ordered moment was evaluated at 3.5 K to be $m\,{=}\,0.39(3)\,μ_{\rm B}$ for SLCSO and $0.37(1)\,μ_{\rm B}$ for SLCNO, which are significantly smaller than those calculated using linear spin wave theory. We infer that the small ordered moment is caused by the effect of exchange bond randomness arising from the site disorder of Sr and La ions.
