Kondo scattering observed at a single magnetic impurity
Kondo scattering observed at a single magnetic impurity
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DOI：
10.1103/physrevlett.80.2893
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发表时间：
1998-03-30
影响因子：
8.6
通讯作者：
Delley, B
中科院分区：
文献类型：
--
作者：
Li, JT;Schneider, WD;Delley, B
用低温扫描隧道显微镜研究了孤立的Ce原子在Ag（111）表面的电子散射。在Ce上和Ce附近获得的Tunnel谱揭示了费米能附近的特征倾角，这是不存在的Ag吸附原子。该特征在表面处的Ce原子周围的几个原子直径上被检测到。从本地化的f电子的隧道电流携带连续状态的过渡矩阵元素具有很强的相似性离散自电离状态。我们解释的倾角频谱作为Fano干扰的限制，其中f轨道有一个非常小的矩阵元素。
Electron scattering of isolated Ce adatoms on Ag(111) surfaces was studied with a low-temperature scanning tunneling microscope. Tunneling spectra obtained on and near Ce reveal a characteristic dip around the Fermi energy which is absent for nonmagnetic Ag adatoms. This feature is detected over a few atomic diameters around Ce atoms at the surface. The transition matrix element from the localized f electron to the tunnel-current carrying continuum states bears a strong resemblance to discrete autoionized states. We interpret the dip spectrum as a Fano interference for the limit where the f orbital has a very small matrix element.