The current $I$ through nickelocene molecules and its noise are measured with a low temperature scanning tunneling microscope on a Cu(100) substrate. Density functional theory calculations and many-body modeling are used to analyze the data. During contact formation, two types of current evolution are observed, an abrupt jump to contact and a smooth transition. These data along with conductance spectra ($dI/dV$) recorded deep in the contact range are interpreted in terms of a transition from a spin-1 to a spin- state that is Kondo screened. Many-body calculations show that the smooth transition is also consistent with a renormalization of spin excitations of a spin-1 molecule by Kondo exchange coupling. The shot noise is significantly reduced compared to the Schottky value of $2eI$. The noise can be described in the Landauer picture in terms of the spin polarization of the transmission of $\approx 35$,% through two degenerate $d_{\pi }$-orbitals of the Nickelocene molecule.

中文翻译：

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散粒噪声探测的镍茂铜触点的自旋相关传输

目前 $\mathrm{一世}$通过低温扫描隧道显微镜在Cu（100）基板上测量新星分子的穿透过程及其噪声。密度泛函理论计算和多体建模用于分析数据。在接触形成过程中，观察到两种类型的电流演化，即突然跃迁至接触和平稳过渡。这些数据以及电导光谱（$d\mathrm{一世}/dV$在接触范围深处记录的）被解释为从自旋1到经过近藤筛选的自旋状态的转变。多体计算表明，平滑过渡也与通过近藤交换偶联使spin-1分子的自旋激发重新规范化相一致。与的肖特基值相比，散粒噪声显着降低。$2Ë\mathrm{一世}$。噪声可以在Landauer图片中根据传输的自旋极化来描述$\approx 35$，％通过两次简并 $d_{\pi }$茂分子的-轨道。