Magnetic anisotropy in Shiba bound states across a quantum phase transition.
Magnetic anisotropy in Shiba bound states across a quantum phase transition.
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DOI：
10.1038/ncomms9988
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发表时间：
2015-11-25
影响因子：
16.6
通讯作者：
Franke KJ
中科院分区：
文献类型：
--
作者：
Hatter N;Heinrich BW;Ruby M;Pascual JI;Franke KJ
磁性吸附剂与超导衬底之间的交换耦合导致超导能隙内的柴叶态和隙外的近藤共振。交换耦合强度决定了量子多体基态是近藤单线态还是成对超导准粒子的单线态。在这里，我们使用扫描隧道光谱来识别铅（111）上酞菁锰的不同量子基态。我们观察到Shiba态，它被磁晶各向异性分裂成三重态。它们特有的谱权为量子基态的性质提供了明确的证据。我们的研究结果提供了对超导主体上磁性杂质相图的实验见解，并揭示了磁性各向异性对多体相互作用的影响。磁性吸附物与超导表面之间的交换耦合强度决定了系统量子基态的性质。在这里，作者使用扫描隧道显微镜来探索吸附在Pb（111）表面的酞菁锰的基态和激发态性质。
The exchange coupling between magnetic adsorbates and a superconducting substrate leads to Shiba states inside the superconducting energy gap and a Kondo resonance outside the gap. The exchange coupling strength determines whether the quantum many-body ground state is a Kondo singlet or a singlet of the paired superconducting quasiparticles. Here we use scanning tunnelling spectroscopy to identify the different quantum ground states of manganese phthalocyanine on Pb(111). We observe Shiba states, which are split into triplets by magnetocrystalline anisotropy. Their characteristic spectral weight yields an unambiguous proof of the nature of the quantum ground state. Our results provide experimental insights into the phase diagram of a magnetic impurity on a superconducting host and shine light on the effects induced by magnetic anisotropy on many-body interactions. The exchange coupling strength between magnetic adsorbates and a superconducting surface determines the nature of the system's quantum ground state. Here, the authors use scanning tunnelling microscopy to explore the ground state and excited state properties of manganese phthalocyanine adsorbed on a Pb(111) surface.