Enhancing easy-plane anisotropy in bespoke Ni(II) quantum magnets
Enhancing easy-plane anisotropy in bespoke Ni(II) quantum magnets
复制标题
增强定制Ni（II）量子磁体的易平面各向异性
DOI：
10.1016/j.poly.2020.114379
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发表时间：
2020-04-01
期刊：
影响因子：
2.6
通讯作者：
Singleton, John
中科院分区：
文献类型：
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作者：
Manson, Jamie L.;Manson, Zachary E.;Singleton, John
研究了几种S = 1的Ni（II）配位化合物、分子和聚合物的晶体结构和磁性，包括桥连配体HF_2，AF（6）（2）（A = Ti，Zr）和吡嗪，非桥连配体F，SiF_（62），甘氨酸，水，1-乙烯基咪唑，4-甲基吡唑和3-羟基吡啶。伪八面体NiN 4F 2、NiN 4 O2或NiN 4 OF核由等于或略长于轴向Ni-L-ax键的赤道Ni-N键组成。通过设计，零场分裂（D）在这些系统中很大，并且在存在大量交换相互作用（J）的情况下，可能难以与粉末样品上的磁力测量区分开。因此，我们在这些情况下依赖于脉冲场磁化，并采用电子自旋共振（ESR）来确认D时，J 0）和范围从约8-25 K。虽然配体的光谱化学性质可能起重要作用，但这项工作揭示了比值d（Ni-L-ax）/d（Ni-N-eq）与D之间的线性相关性。我们断言，这种关系使我们能够预测定制的Ni（II）量子磁体的磁晶各向异性的类型。(C)2020年，任作家。爱思唯尔有限公司出版
We examine the crystal structures and magnetic properties of several S = 1 Ni(II) coordination compounds, molecules and polymers, that include the bridging ligands HF2, AF(6)(2) (A = Ti, Zr) and pyrazine or non-bridging ligands F, SiF62, glycine, H2O, 1-vinylimidazole, 4-methylpyrazole and 3-hydroxypyridine. Pseudo-octahedral NiN4F2, NiN4O2 or NiN4OF cores consist of equatorial Ni-N bonds that are equal to or slightly longer than the axial Ni-L-ax bonds. By design, the zero-field splitting (D) is large in these systems and, in the presence of substantial exchange interactions (J), can be difficult to discriminate from magnetometry measurements on powder samples. Thus, we relied on pulsed-field magnetization in those cases and employed electron-spin resonance (ESR) to confirm D when J 0) and range from approximate to 8-25 K. This work reveals a linear correlation between the ratio d(Ni-L-ax)/d(Ni-N-eq) and D although the ligand spectrochemical properties may play an important role. We assert that this relationship allows us to predict the type of magnetocrystalline anisotropy in tailored Ni(II) quantum magnets. (C) 2020 The Authors. Published by Elsevier Ltd.