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首页> 外文期刊>Chemistry: A European journal >S=1/2 One-Dimensional Random-Exchange Ferromagnetic Zigzag Ladder, Which Exhibits Competing Interactions in a Critical Regime
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S=1/2 One-Dimensional Random-Exchange Ferromagnetic Zigzag Ladder, Which Exhibits Competing Interactions in a Critical Regime

机译：S = 1/2一维随机交换铁磁曲折梯子，在临界状态下表现出相互竞争的相互作用

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The synthesis, crystal structure, and magnetic properties (from a combined experimental and First-Principles Bottom-Up theoretical study) of the new compound catena-dichloro(2-Cl-3Mpy)copper(II), 1, [2-Cl-3Mpy=2- chloro-3-methylpyridine] are described and rationalized. Crystals of 1 present well isolated magnetic 1D chains (no 3D order was experimentally observed down to 1.8 K) and magnetic frustration stemming from competing ferromagnetic nearest-neighbor (J_(NN)) interactions and antiferromagnetic next-nearest neighbor (J_(NNN)) interactions, in which α= J_(NNN)/J_(NN) <-0.25. These magnetic interactions give rise to a unique magnetic topology: a two-leg zigzag ladder composed of edge-sharing up-down triangles with antiferromagnetic interactions along the rails and ferromagnetic interactions along the zigzag chain that connects the rails. Crystals of 1 also present a random distribution of the 2-Cl-3Mpy groups, which are arranged in two different orientations, each with a 50% occupancy. This translates into a random static structural disorder within each chain by virtue of which the value of the J_(NN) magnetic interactions can randomly take one of the following three values: 53, 36, and 16 cm~(-1). The structural disorder does not affect the J_(NNN) value, which in all cases is approximately -9 cm~(-1). A proper statistical treatment of this disorder provides a computed magnetic susceptibility curve that reproduces the main features of the experimental data.
机译：新型化合物catena-dichloro（2-Cl-3Mpy）copper（II），1，[2-Cl-的合成，晶体结构和磁性能（来自组合实验和第一原理自下而上的理论研究）描述并合理化了3Mpy ＝ 2-氯-3-甲基吡啶]。 1个晶体目前存在良好隔离的1D磁性链（实验未观察到低至1.8 K的3D顺序），以及由于竞争性铁磁性最近邻（J_（NN））相互作用和反铁磁性最近邻（J_（NNN））引起的磁挫折相互作用，其中α= J_（NNN）/ J_（NN）<-0.25。这些磁性相互作用产生了独特的磁性拓扑：一个由两边折起来的三角形组成的两腿之字形梯子，沿着铁轨具有反铁磁相互作用，沿着连接铁轨的锯齿链具有铁磁相互作用。 1的晶体还具有随机分布的2-Cl-3Mpy基，它们以两个不同的方向排列，每个方向的占有率为50％。这转化为每条链中的随机静态结构异常，据此，J_（NN）磁性相互作用的值可以随机采用以下三个值之一：53、36和16 cm〜（-1）。结构紊乱不影响J_（NNN）值，在所有情况下，该值均约为-9 cm〜（-1）。对该疾病进行适当的统计学处理可提供计算出的磁化率曲线，该曲线可再现实验数据的主要特征。

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