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arXiv 1006.0134cond-mat.supr-concond-mat.str-el
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d波超导-铁磁结中的界面效应

Interface effects in d-wave superconductor-ferromagnet junctions

T. Kirzhner, G. Koren

摘要:

本文报道YBa_2Cu_3O_7-SrRuO_3和YBa_2Cu_3O_7-La_(0.67)Ca_(0.33)MnO_3斜坡型结沿结和反结方向的微分电导谱的测量结果。结果是一致的交叉Andreev反射效应,只有在YBa 2Cu 3 O 7-SrRuO 3结的畴壁宽度的SrRuO 3是可比的YBa 2Cu 3 O 7的相干长度。在YBa 2Cu 3 O 7-La0.67Ca0.33MnO3结中没有观察到这种效应,这与La0.67Ca0.33MnO3的大得多的(x10)畴壁宽度一致。我们还表明,交叉Andreev只存在于反节点方向。此外,我们发现的证据表明,交叉Andreev在YBa_2Cu_3O_7结是不敏感的纳米尺度的界面缺陷,这表明交叉Andreev效应的长度尺度大于相干长度,但仍然小于La_(0.67)Ca_(0.33)MnO_3的畴壁宽度。

英文摘要:

Measurements of the differential conductance spectra of YBa2Cu3O7-SrRuO3 and YBa2Cu3O7-La0.67Ca_0.33MnO3 ramp-type junctions along the node and anti-node directions are reported. The results are consistent with a crossed Andreev reflection effect only in YBa2Cu3O7-SrRuO3 junctions where the domain wall width of SrRuO3 is comparable with the coherence length of YBa2Cu3O7. No such effect was observed in the YBa2Cu3O7-La0.67Ca0.33MnO3 junctions, which is in line with the much larger (x10) domain wall width of La0.67Ca0.33MnO3. We also show that crossed Andreev exists only in the anti-node direction. Furthermore, we find evidence that crossed Andreev in YBa2Cu3O7 junctions is not sensitive to nm-scale interface defects, suggesting that the length scale of the crossed Andreev effect is larger than the coherence length, but still smaller than the La0.67Ca0.33MnO3's domain wall width.

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