Interface effects in d-wave superconductor-ferromagnet junctions in the vicinity of domain walls

Article

关键词: TUNNELING SPECTROSCOPY;    THIN-FILMS;    SRRUO3;   

DOI  :  10.1103/PhysRevB.82.134507

来源: SCIE

【 摘 要 】

Measurements of the differential conductance spectra of YBa(2)Cu(3)O(7-delta)-SrRuO(3) and YBa(2)Cu(3)O(7-delta)-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(2)Cu(3)O(7-delta)-SrRuO(3) junctions where the domain-wall width of SrRuO(3) is comparable with the coherence length of YBa(2)Cu(3)O(7-delta). No such effect was observed in the YBa(2)Cu(3)O(7-delta)-La(0.67)Ca(0.33)MnO(3) junctions, which is inline with the much larger (X10) 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(2)Cu(3)O(7-delta) 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.

【 授权许可】

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