Competition of Superconducting Phenomena and Kondo Screening at the Nanoscale
Competition of Superconducting Phenomena and Kondo Screening at the Nanoscale
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DOI：
10.1126/science.1202204
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发表时间：
2011-05-20
期刊：
影响因子：
56.9
通讯作者：
Pascual, J. I.
中科院分区：
文献类型：
--
作者：
Franke, K. J.;Schulze, G.;Pascual, J. I.
磁和超导相互作用将电子耦合在一起，形成复杂的物质状态。我们表明，在原子尺度上，这两种类型的相互作用可以共存，并竞争影响本地化磁矩的基态。在4.5K的局域谱中，酞菁锰（MnPc）吸附在Pb（111）上形成的自旋为1的体系可以处于两种不同的磁基态。这些是由近藤屏蔽和超导对破坏相互作用之间的平衡决定的。两种基态在纳米尺度上交替，形成莫尔状的超结构。因此，连接两个（单重态和二重态）基态的量子相变可以通过分子-铅相互作用的微小变化来调节。
Magnetic and superconducting interactions couple electrons together to form complex states of matter. We show that, at the atomic scale, both types of interactions can coexist and compete to influence the ground state of a localized magnetic moment. Local spectroscopy at 4.5 kelvin shows that the spin-1 system formed by manganese-phthalocyanine (MnPc) adsorbed on Pb(111) can lie in two different magnetic ground states. These are determined by the balance between Kondo screening and superconducting pair-breaking interactions. Both ground states alternate at nanometer length scales to form a Moire-like superstructure. The quantum phase transition connecting the two (singlet and doublet) ground states is thus tuned by small changes in the molecule-lead interaction.