Contrasting magnetic structures in SrLaCuSbO6 and SrLaCuNbO6: spin-1/2 square-lattice J1－J2 Heisenberg antiferromagnets
Contrasting magnetic structures in SrLaCuSbO6 and SrLaCuNbO6: spin-1/2 square-lattice J1－J2 Heisenberg antiferromagnets
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SrLaCuSbO6 和 SrLaCuNbO6 的磁性结构对比：自旋 1/2 方晶格 J1－J2 海森堡反铁磁体
DOI：
10.1103/physrevb.105.054414
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
T. Goto and M. Hagihala
中科院分区：
文献类型：
--
作者：
M. Watanabe;N. Kurita;H. Tanaka;W. Ueno;K. Matsui;T. Goto and M. Hagihala
报道了双钙钛矿（SLCSO）和双钙钛矿（SLCNO）的磁性能。两种化合物的磁化率随温度的变化均表现出方形晶格海森堡反铁磁体的宽极大特性。SLCSO和SLCNO分别在15.7 K和15.7 K时发生磁有序。中子粉末衍射测量揭示了两种化合物中不同的自旋结构。SLCSO和SLCNO的自旋结构分别为nsamel反铁磁性和柱状反铁磁性。结果表明，SLCSO中最近邻相互作用占主导地位，而SLCNO中次近邻相互作用占主导地位。在SLCSO和SLCNO之前的3.5 K处计算了有序矩的大小，其值明显小于线性自旋波理论计算的值。我们推断，小的有序矩是由Sr和La离子的位置无序引起的键随机性的影响引起的。
We report the magnetic properties of the double perovskites(SLCSO) and(SLCNO). The temperature dependence of the magnetic susceptibilities of both compounds shows a broad maximum characteristic of ansquare lattice Heisenberg antiferromagnet. Magnetic ordering occurs atand 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 beloware Néel antiferromagnetic and columnar 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 befor SLCSO andfor 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 bond randomness arising from the site disorder of Sr and La ions.