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arXiv 1710.04599cond-mat.supr-con
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Yu-Shiba-Rusinov能量在弱耦合Kondo体系中的标度

Scaling of Yu-Shiba-Rusinov energies in the weak-coupling Kondo regime

Nino Hatter, Benjamin W. Heinrich, Daniela Rolf, Katharina J. Franke

摘要:

超导体上顺磁杂质的自由自旋态与屏蔽杂质的竞争可用近藤屏蔽$k_BT_K$与超导配对能$Δ$的能量标度来表征。当实验温度抑制近藤屏蔽,但保持超导性,即,当$Δ/k_B > T > T_K$时,此描述失败。在这里,我们探讨了这个温度范围内的一组锰酞菁分子修饰与氨(MnPc-NH $_3$)的铅(111)。我们表明,这些分子表现出弱耦合近藤共振满足所需的能量条件。我们关联了超导能隙内Yu-Shiba-Rusinov(YSR)束缚态的能量与近藤共振强度。我们揭示了束缚态能量遵循超导体上经典自旋的期望。这一发现是重要的,鉴于许多理论预测使用经典的自旋模型,特别是在超导衬底上的磁性纳米结构的马约拉纳束缚态的描述。

英文摘要:

The competition of the free spin state of a paramagnetic impurity on a superconductor with its screened counterpart is characterized by the energy scale of Kondo screening $k_BT_K$ compared to the superconducting pairing energy $Δ$. When the experimental temperature suppresses Kondo screening, but preserves superconductivity, i.e., when $Δ/k_B > T > T_K$, this description fails. Here, we explore this temperature range in a set of manganese phthalocyanine molecules decorated with ammonia (MnPc-NH$_3$) on Pb(111). We show that these molecules suffice the required energy conditions by exhibiting weak-coupling Kondo resonances. We correlate the energy of the Yu-Shiba-Rusinov (YSR) bound states inside the superconducting energy gap with the intensity of the Kondo resonance. We reveal that the bound state energy follows the expectations for a classical spin on a superconductor. This finding is important in view of many theoretical predictions using a classical spin model, in particular for the description of Majorana bound states in magnetic nanostructures on superconducting substrates.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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