赝二元第一行过渡金属硫氰酸盐$\it{M}$（NCS）$_{2}$的磁相互作用增强
Strengthening the magnetic interactions in pseudobinary first-row transition metal thiocyanates, $\it{M}$(NCS)$_{2}$
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体的关键。磁性二价第一行过渡金属硫氰酸盐是一类化学结构简单的层状分子骨架。在这里，我们报告了两个新的家庭成员，锰（II）硫氰酸盐，锰（NCS）$_{2}$，铁（II）硫氰酸盐，铁（NCS）$_{2}$。使用磁化率测量这些材料和钴（II）硫氰酸盐和镍（II）硫氰酸盐，钴（NCS）$_{2}$和镍（NCS）$_{2}$，分别，我们确定了显着更强的净反铁磁相互作用之间的早期TM离子，降低外斯常数，θ，从Ni（NCS）$_{2}$的29 K到Mn（NCS）$_{2}$的-115 K-这是更扩散的3d轨道、增加的轨道重叠和增加的未配对$\it{t}$ $_{2g}$电子数目的结果。研究表明：Mn（NCS）$_{2}$，Fe（NCS）$_{2}$和Co（NCS）$_{2}$有序排列成反铁磁的公度基态，而Ni（NCS）$_{2}$则是由反铁磁有序层堆叠而成的基态结构.我们表明，磁性分子框架具有显着更强的净交换相互作用，可以通过使用较早的TM。
英文摘要：
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.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
