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Muoniated radical formation and spin dynamics in molecular magnetic materials with oxalate ligands

机译:具有草酸酯配体的分子磁性材料中的胺基化自由基形成和自旋动力学

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The crystal structure of Na2T2(ox)(2)(H2O)(2) With T = Ni(II), Co(II), Fe(II), and Mn(II) consists of isostructural compounds with an anionic transition metal oxalate network with a 2-leg ladder topology. We performed zero external field mu SR, longitudinal-field quenching (LFQ) and avoided level-crossing (ALC) measurements on the Co-compound of this series. The measurements show that a significant fraction of the implanted muons forms a muoniated radical state by muonium addition to the resonant pi electron system of the (COO)(2)(2-) group. The LFQ measurements reveal electronic spin fluctuation rates of several GHz. For reference, ALC measurements on the nonmagnetic compounds Li-2(ox)(2) and Na-2(ox)(2) were carried out and the muon hyperfine coupling constant were deduced to 115 and 150 MHz, respectively. (c) 2005 Elsevier B.V. All rights reserved.
机译:Na = T(Ni),Co(II),Fe(II)和Mn(II)的Na2T2(ox)(2)(H2O)(2)的晶体结构由具有阴离子过渡金属草酸盐的同构化合物组成带有两脚梯形拓扑的网络。我们对该系列的复合化合物进行了零外场mu SR,纵向场猝灭(LFQ)和避免水平交叉(ALC)测量。测量表明,通过将mu添加到(COO)(2)(2-)基团的共振π电子系统中,很大一部分被注入的μ子形成了oni化的自由基态。 LFQ测量显示出数GHz的电子自旋波动率。作为参考,对非磁性化合物Li-2(ox)(2)和Na-2(ox)(2)进行了ALC测量,并将μon超精细耦合常数分别推导出为115和150 MHz。 (c)2005 Elsevier B.V.保留所有权利。

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