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首页> 外文会议>Progress in High-Temperature Superconducting Transistors and Other Devices II >Synthesis and transport properties of a-axis YBa2Cu3O7/PrBa2Cu3O7 superlattices
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Synthesis and transport properties of a-axis YBa2Cu3O7/PrBa2Cu3O7 superlattices

机译：a轴YBa2Cu3O7 / PrBa2Cu3O7超晶格的合成与输运性质

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Abstract: We report recent results on the synthesis and transport properties of a-axis oriented YBa$-2$/Cu$-3$/O$-7$//PrBa$-2$/Cu$- 3$/O$-7$/ (YBCO/PBCO) superlattices. A-axis oriented YBCO is of great interest in fabricating sandwich tunnel junctions since the coherence length in this direction is much greater than that in the c-axis direction. We use the YBCO/PBCO multilayer system to investigate the decoupling length of the YBCO across PBCO by changing the modulation wavelength. The resistive transitions of these superlattices in magnetic field show a crossover temperature above which they are insensitive to magnetic fields and below which broadening occurs; this may be related to the disappearance of the coupling between YBCO layers above T$+*$/. We have used a 90$DGR off axis sputtering technique to grow a- axis oriented YBCO/PBCO superlattices. In such a-axis heterostructures the artificial modulation of the rare earth atom occurs in the plane between CuO planes. Therefore one would expect interdiffusion of Y and Pr to be more of a problem than in c-axis multilayers. The a-axis multilayers are of good crystalline quality as shown by x-ray, TEM, and RBS analysis. X- ray diffraction yields main peaks and satellite peaks with FWHM of 0.06$DGR while the ratio of the backscattered yield along $LS@100$GRT to that in a random direction $chi@min is 3% and is as good as that found in single crystals. To investigate the decoupling length of the YBCO across PBCO, we measured the resistive transitions of the a 24 angstroms/24 angstroms, 48 angstroms/24 angstroms and 48 angstroms/48 angstroms a-axis YBCO/PBCO multilayers.!5
机译：摘要：我们报道了有关a轴取向的YBa $ -2 $ / Cu $ -3 $ / O $ -7 $ // PrBa $ -2 $ / Cu $ -3 $ / O $的合成和输运性质的最新研究结果。 -7 $ /（YBCO / PBCO）超晶格。由于在该方向上的相干长度远大于在c轴方向上的相干长度，因此A轴取向的YBCO在制造夹层隧道结中非常受关注。我们使用YBCO / PBCO多层系统通过改变调制波长来研究YBCO在PBCO上的去耦长度。这些超晶格在磁场中的电阻跃变显示出一个交越温度，高于该温度时它们对磁场不敏感，低于此温度则发生变宽。这可能与T $ + * $ /以上的YBCO层之间的耦合消失有关。我们已经使用90 $ DGR离轴溅射技术来生长a轴取向的YBCO / PBCO超晶格。在这种α轴异质结构中，稀土原子的人工调制发生在CuO平面之间的平面中。因此，人们希望Y和Pr的相互扩散比c轴多层中的更多。如x射线，TEM和RBS分析所示，a轴多层具有良好的晶体质量。 X射线衍射产生的主峰和卫星峰的FWHM为0.06 $ DGR，而沿$ LS @ 100 $ GRT的反向散射率与沿随机方向$ chi @ min的反向散射率之比为3％，与所发现的一样好在单晶中。为了研究YBCO在整个PBCO上的去耦长度，我们测量了a轴YBCO / PBCO多层24埃/ 24埃，48埃/ 24埃和48埃/ 48埃的电阻跃迁。5

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