原子链中的二位近藤效应
Two-Site Kondo Effect in Atomic Chains
摘要：
利用原子操纵技术在Cu（111）表面制备了CoCu_nCo线性团簇.它们代表了一个具有可调相互作用的双位点近藤系统。扫描隧道光谱揭示了近藤温度T_K随Cu原子数n（n>=3）的振荡。密度泛函计算表明，Cu链介导的Ruderman-Kittel-Kasuya-Yosida相互作用引起了振荡.计算发现铁磁和反铁磁相互作用，n=1和2，分别。这两种相互作用都导致T_K的降低。
英文摘要：
Linear CoCu_nCo clusters on Cu(111) are fabricated by means of atomic manipulation. They represent a two-site Kondo system with tunable interaction. Scanning tunneling spectroscopy reveals oscillations of the Kondo temperature T_K with the number n of Cu atoms for n>=3. Density functional calculations show that the Ruderman-Kittel-Kasuya-Yosida interaction mediated by the Cu chains causes the oscillations. Calculations find ferromagnetic and antiferromagnetic interaction for n=1 and 2, respectively. Both interactions lead to a decrease of T_K as experimentally observed.
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