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arXiv 1302.4896cond-mat.supr-con
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具有超导/反铁磁界面的混合异质结构

Hybrid heterostructures with superconducting/antiferromagnetic interfaces

G. A. Ovsyannikov, K. Y. Constantinian, Yu. V. Kislinskii, A. V. Shadrin, Yu. Khaydukov, T. Keller, A. L. Vasiliev

摘要:

我们报告了具有铜酸盐反铁磁夹层Ca1-xSrxCuO2(CSCO)的混合超导台面异质结构的结构、直流、X射线和中子研究。上电极为Nb/Au双层超导体,下电极为氧化铜超导体YBa_2Cu_3O_7(YBCO)。实验结果表明,在外延生长YBCO和CSCO两种薄膜的过程中,在CSCO中间层约20 nm处发生了载流子掺杂。掺杂部分的CSCO层的导电性接近金属型,而直接沉积在NdGaO3衬底上的参考CSCO膜表现为具有跳跃导电性的莫特绝缘体。在异质结横截面的明场图像上可以清楚地看到Au/CSCO界面,该界面对台面异质结的总电阻有主要贡献。

英文摘要:

We report on structural, DC, X-ray and neutron studies of hybrid superconducting mesa-heterostructures with a cuprate antiferromagnetic interlayer Ca1-xSrxCuO2 (CSCO). The upper electrode was bilayer Nb/Au superconductor and copper oxide superconductor YBa2Cu3O7 (YBCO) was the bottom electrode. It was experimentally shown that during the epitaxial growth of the two films YBCO and CSCO a charge carrier doping takes place in the CSCO interlayer with a depth about 20 nm. The conductivity of the doped part of CSCO layer is close to the metal type, while the reference CSCO film, deposited directly on NdGaO3 substrate, behaves as Mott insulator with the hopping conductivity. The interface Au/CSCO is clearly seen on bright-field image of the cross-section of heterostructure and gives the main contribution to the total resistance of mesa-heterostructure.

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