Electrical properties of fluorine-intercalated layered manganite: La1.4Sr1.6Mn2O7F2
Electrical properties of fluorine-intercalated layered manganite: La1.4Sr1.6Mn2O7F2
复制标题
DOI：
10.1016/j.jallcom.2014.10.099
复制
发表时间：
2015-02-25
影响因子：
6.2
通讯作者：
Liu, Chia-Jyi
中科院分区：
文献类型：
--
作者：
Bhaskar, Ankam;Sheu, C. -S.;Liu, Chia-Jyi
采用氟化剂NH4F插层双层亚锰矿La1.4Sr1.6Mn2O7，通过固相反应生成La1.4Sr1.6Mn2O7F2。相对于母体化合物La1.4Sr1.6Mn2O7，氟的插入导致a轴收缩约0.116埃，c轴膨胀约3.152埃。由于O-2和F之间的静电排斥，Mn-O键长发生变化。Rietveld分析表明，与La1.4Sr1.6Mn2O7相比，La1.4Sr1.6Mn2O7F2中Mn-O(1)的键长更长，Mn-O(2)和Mn-O(3)的键长更短。 La1.4Sr1.6Mn2O7F2 的电阻率表现出绝缘行为，并表现出与 La1.4Sr1.6Mn2O7 显着不同的行为。我们首次报道了 La1.4Sr1.6Mn2O7F2 电阻率的温度依赖性。磁测量表明，局部磁矩的磁序被氟插入间隙位置所抑制。 (C) 2014 Elsevier B.V. 保留所有权利。
Fluorinating agent NH4F is employed to intercalate the bi-layered manganite La1.4Sr1.6Mn2O7 to form La1.4Sr1.6Mn2O7F2 using solid state reaction. The insertion of fluorine results in a contraction of similar to 0.116 angstrom in the a axis and an expansion of similar to 3.152 A in the c axis with respect to the parent compound La1.4Sr1.6Mn2O7. The Mn-O bond lengths are altered due to the electrostatic repulsion between O-2 and F. Rietveld analysis indicates that a longer bond length of Mn-O(1) and shorter bond lengths of Mn-O(2) and Mn-O(3) has been found in La1.4Sr1.6Mn2O7F2 when compared to La1.4Sr1.6Mn2O7. The electrical resistivity of La1.4Sr1.6Mn2O7F2 shows insulating behavior and exhibits remarkably different behavior from La1.4Sr1.6Mn2O7. For the first time, we report the temperature dependence of electrical resistivity of La1.4Sr1.6Mn2O7F2. Magnetic measurements indicate that the magnetic order of local moments is suppressed by fluorine insertion into interstitial sites. (C) 2014 Elsevier B.V. All rights reserved.