Surface anisotropy and the Kondo effect in restricted geometry (invited)
Surface anisotropy and the Kondo effect in restricted geometry (invited)
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受限几何中的表面各向异性和近藤效应（特邀）
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
A. Zawadowski
中科院分区：
文献类型：
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作者：
O. Ujsághy;L. Borda;A. Zawadowski
近年来，几个小组通过实验证明，在薄膜中，近藤效应的幅度较小，但与本体值相比，近藤温度大致相同。我们发展了一种与 KdSz2 成正比的表面各向异性理论，其中 Sz 是垂直于表面的杂质自旋分量，Kd 是与从表面测量的距离的倒数成正比的振幅。各向异性是由于传导电子不仅通过交换相互作用与磁性杂质相互作用，而且通过自旋轨道相互作用与主体原子相互作用，这使得杂质自旋能够获得有关样品形状的信息。在样品表面附近和低温下，自旋自由度冻结在单重基态，自旋 S=2，因此表面的杂质不会对近藤异常产生影响，这与基态简并的 S=5/2 情况相反。表面理论...
In recent years, several groups have demonstrated experimentally that in thin films the Kondo effect has a smaller amplitude but roughly the same Kondo temperature compared to the bulk values. We have developed a theory of surface anisotropy proportional to KdSz2, where Sz is the component of the impurity spin perpendicular to the surface and Kd is an amplitude which is proportional to the inverse of the distance measured from the surface. The anisotropy is due to the fact that conduction electrons interact not only with the magnetic impurity by the exchange interaction, but also with the host atoms by the spin-orbit interaction, which allows the impurity spin to get information about the shape of the sample. Near the surface of the sample and at low temperature, the spin degrees of freedom freeze in the singlet ground state for spin S=2 so that the impurities at the surface cannot contribute to the Kondo anomaly, in contrast to the case S=5/2 where the ground state is degenerate. The theory of the surfac...