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首页> 外文期刊>Physical review >Interface effects in rf-wave superconductor-ferromagnet junctions in the vicinity of domain walls
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Interface effects in rf-wave superconductor-ferromagnet junctions in the vicinity of domain walls

机译：畴壁附近的射频波超导体-铁磁体结中的界面效应

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摘要

Measurements of the differential conductance spectra of YBa_2Cu_3O_(7-δ)-SrRuO_3 and YBa_2Cu_3O_(7-δ)-La_(0.67)Ca_(0.33)MnO_3 ramp-type junctions along the node and antinode directions are reported. Interpretation of the results in terms of crossed Andreev reflection effect and induced triplet superconductivity are discussed. The results are consistent with a crossed Andreev reflection effect only in YBa_2Cu_3O_(7-δ)-SrRuO_3 junctions where the domain-wall width of SrRuO_3 is comparable with the coherence length of YBa_2Cu_3O_(7-δ). No such effect was observed in the YBa_2Cu_3O_(7-δ)-La_(0.67)Ca_(0.33)MnO_3 junctions, which is inline with the much larger (X 10) domain-wall width of La_(0.67)Ca_(0.33)MnO_3. We also show that crossed Andreev exists only in the antinode direction. Furthermore, we find evidence that crossed Andreev in YBa_2Cu_3O_(7-δ) junctions is not sensitive to nanometer-scale interface defects, suggesting that the length scale of the crossed Andreev effect is larger than the coherence length, but still smaller than the La_(0.67)Ca_(0.33)MnO_3's domain-wall width.
机译：报道了沿节点和波腹方向对YBa_2Cu_3O_（7-δ）-SrRuO_3和YBa_2Cu_3O_（7-δ）-La_（0.67）Ca_（0.33）MnO_3斜坡型结的差分电导谱的测量。讨论了关于交叉安德列夫反射效应和感应三重态超导性的结果解释。结果与仅在YBa_2Cu_3O_（7-δ）-SrRuO_3结中的交叉安德烈夫反射效应一致，其中SrRuO_3的畴壁宽度与YBa_2Cu_3O_（7-δ）的相干长度相当。在YBa_2Cu_3O_（7-δ）-La_（0.67）Ca_（0.33）MnO_3结中未观察到这种影响，这与La_（0.67）Ca_（0.33）MnO_3的更大（X 10）畴壁宽度一致。 。我们还表明，交叉的Andreev仅在波腹方向上存在。此外，我们发现有证据表明YBa_2Cu_3O_（7-δ）结中的交叉安德列夫对纳米级界面缺陷不敏感，这表明交叉的安德列夫效应的长度尺度大于相干长度，但仍小于La_（ 0.67）Ca_（0.33）MnO_3的畴壁宽度。

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