三减二十面体Fe $_9$ \}纳米团簇的非弹性中子散射磁谱
Magnetic spectra in the tridiminished-icosahedron \{Fe$_9$\} nano-cluster by inelastic neutron scattering
摘要：
低温下外加磁场下的非弹性中子散射（INS）实验表明，在所谓的三缩铁二十面体磁性分子中存在详细的低激发态。磁性分子由九个铁Fe $^{3+}$（$s = 5/2$）和三个磷原子组成，它们位于一个近乎完美的二十面体的十二个顶点上。三个磷原子形成一个平面，将铁簇分成两个弱耦合的三离子和六离子碎片，分别为\{Fe $_3$ \}和\{Fe $_6$ \}。磁场INS结果显示出$S=1/2$基态，预期来自具有粉末平均$g$值$=2.00$的\{Fe $_3$ \}三元组的完美等边三角形。两组三重激发的温度和磁场依赖性表明$S=0$基态与两个非简并$S=1$状态归因于\{Fe $_6$ \}片段。分裂可能是由于两个片段之间的有限耦合，单离子各向异性，反对称交换耦合，或从其三角形构建块的磁阻挫。
英文摘要：
Inelastic neutron scattering (INS) experiments under applied magnetic field at low temperatures show detailed low lying magnetic excitations in the so called tridiminshed iron icosahedron magnetic molecule. The magnetic molecule consists of nine iron Fe$^{3+}$ ($s = 5/2$) and three phosphorous atoms that are situated on the twelve vertices of a nearly perfect icosahedron. The three phosphorous atoms form a plane that separates the iron cluster into two weakly coupled three- and six-ion fragments, \{Fe$_3$\} and \{Fe$_6$\}, respectively. The magnetic field INS results exhibit an $S=1/2$ ground state expected from a perfect equilateral triangle of the \{Fe$_3$\} triad with a powder averaged $g$-value $=2.00$. Two sets of triplet excitations whose temperature and magnetic field dependence indicate an $S=0$ ground state with two non-degenerate $S=1$ states are attributed to the \{Fe$_6$\} fragment. The splitting may result from a finite coupling between the two fragments, single-ion anisotropy, antisymmetric exchange couplings, or from magnetic frustration of its triangular building blocks.
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