Tuning odd triplet superconductivity by spin pumping
Tuning odd triplet superconductivity by spin pumping
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DOI：
10.1103/physrevb.80.104416
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发表时间：
2009-06
影响因子：
3.7
通讯作者：
T. Yokoyama;Y. Tserkovnyak
中科院分区：
文献类型：
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作者：
T. Yokoyama;Y. Tserkovnyak
利用铁磁体的进动磁化研究了扩散铁磁体/正金属/超导体结中的接近效应。我们发现在正常金属中产生的奇频对被铁磁体的自旋抽运修正，因此可以通过改变进动频率来调谐。在两倍超导间隙对应的频率处，奇频配对被强烈增强。我们发现，在正常金属中，通过调整进动频率，奇频对可以优于偶频对。这给了扫描隧道显微镜观察到的奇频超导性一个清晰的特征。根据正常金属的配对对称性，我们发现正常金属与扫描隧道显微镜尖端之间的隧道电导从间隙到峰值结构有一个交叉。
We study proximity effect in diffusive ferromagnet/normal-metal/superconductor junction with precessing magnetization of the ferromagnet. We find that the odd-frequency pairing induced in the normal metal is modified by spin pumping from the ferromagnet and hence can be tuned by changing the precessional frequency. At the frequency corresponding to twice the superconducting gap, the odd-frequency pairing is strongly enhanced. We find that the odd-frequency pairing can be dominant over the even-frequency pairing in the normal metal by tuning the precessional frequency. This gives a clearcut signature of the odd-frequency superconductivity observable by scanning-tunneling microscopy. According to the pairing symmetries in the normal metal, we find a crossover from the gap to the peak structure in the tunneling conductance between the normal metal and a scanning-tunneling microscope tip.