论文标题
加强伪近似第一行转换金属硫代苯甲酸盐中的磁相互作用，$ \ it {m} $（ncs）$ _ {2} $
Strengthening the magnetic interactions in pseudobinary first-row transition metal thiocyanates, $\it{M}$(NCS)$_{2}$
论文作者
论文摘要
了解化学成分对磁相互作用强度的影响是设计具有更强交换相互作用的磁铁的关键。磁性二价第一线过渡金属（TM）硫氰酸酯是一类简单的分层分子框架。在这里，我们报告了两个家庭的新成员，锰（ii）硫氰酸酯，明尼苏达州（NCS）$ _ {2} $和铁（ii）硫代烷酸盐，fe（ncs）$ _ {2} $。使用这些材料和钴（II）硫氰酸酯和镍（II）硫代酯，CO（NCS）$ _ {2} $和Ni（NCS）$ _ {2} $的磁敏感性测量Ni（ncs）$ _ {2} $ to -115 k的Mn（NCS）$ _ {2} $ - 这是更多散射3D轨道的结果，增加了轨道重叠和增加数量的未配对的$ \ iT {T} $ \ it {T} $$ _ {2G} $ elect。我们阐明了这些材料的磁性结构：Mn（NCS）$ _ {2} $，Fe（NCS）$ _ {2} $和CO（NCS）$ _ {2} $订购到相同的防fiferromagnetic Compersialate Comperate Comporate Comporate State，而Ni（NCS）$ _ {2} $ _ {2} $ _ {2} $ _ {2} $ _ {2}在抗铁磁性上堆叠。我们表明，可以使用较早的TMS构建具有更强净交换相互作用的磁分子框架。
Understanding the effect of chemical composition on the strength of magnetic interactions is key to the design of magnets with stronger exchange interactions. The magnetic divalent first-row transition metal (TM) thiocyanates are a class of chemically simple layered molecular frameworks. Here, we report two new members of the family, manganese (II) thiocyanate, Mn(NCS)$_{2}$, and iron (II) thiocyanate, Fe(NCS)$_{2}$. Using magnetic susceptibility measurements on these materials and on cobalt (II) thiocyanate and nickel (II) thiocyanate, Co(NCS)$_{2}$ and Ni(NCS)$_{2}$, respectively, we identify significantly stronger net antiferromagnetic interactions between the earlier TM ions-a decrease in the Weiss constant, θ, from 29 K for Ni(NCS)$_{2}$ to -115 K for Mn(NCS)$_{2}$-a consequence of more diffuse 3d orbitals, increased orbital overlap and increasing numbers of unpaired $\it{t}$$_{2g}$ electrons. We elucidate the magnetic structures of these materials: Mn(NCS)$_{2}$, Fe(NCS)$_{2}$ and Co(NCS)$_{2}$ order into the same antiferromagnetic commensurate ground state, whilst Ni(NCS)$_{2}$ adopts a ground state structure consisting of ferromagnetically ordered layers stacked antiferromagnetically. We show that magnetic molecular frameworks with significantly stronger net exchange interactions can be constructed by using earlier TMs.
