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Correlated non-Gaussian phase fluctuations in LaAlO_3/SrTiO_3 heterointerfaces

机译：LaAlO_3 / SrTiO_3异质界面的相关非高斯相位波动

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摘要

We probe the existence of large correlated non-Gaussian phase fluctuations in the vicinity of the superconducting phase transition in the conducting layer residing at the interface of LaAlO_3/SrTiO_3 heterostructures. The non-Gaussian fluctuations appear between the Berezinskii-Kosterlitz-Thouless transition temperature T_(BKT) and the mean-field transition temperature T_c. Subsequent theoretical analysis reveals that non-Gaussianity arises predominantly due to the percolative transition of a Josephson coupled network of superconductors. Our results confirm that the superconductivity in this system is confined to two dimensions. Our study of the non-Gaussian resistance fluctuation spectrum provides a novel means to explore the BKT transition in two-dimensional inhomogeneous superconductors.
机译：我们探讨了存在于LaAlO_3 / SrTiO_3异质结构界面的导电层中超导相变附近的相关大非高斯相位波动的存在。非高斯波动出现在Berezinskii-Kosterlitz-Thouless转变温度T_（BKT）和平均场转变温度T_c之间。随后的理论分析表明，非高斯性主要是由于超导体的约瑟夫森耦合网络的渗透跃迁所致。我们的结果证实，该系统中的超导性仅限于二维。我们对非高斯电阻波动谱的研究为探索二维不均匀超导体中的BKT跃迁提供了一种新颖的手段。

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  • 来源
    《Physical review》 |2016年第8期|085104.1-085104.9|共9页
  • 作者

    Gopi Nath Daptary; Shelender Kumar; Pramod Kumar; Anjana Dogra; N. Mohanta; A. Taraphder; Aveek Bid;

  • 作者单位

    Department of Physics, Indian Institute of Science, Bangalore 560012, India;

    Department of Physics, Indian Institute of Science, Bangalore 560012, India;

    National Physical Laboratory, New Delhi 110012, India,Department of Physics, St. John's College, Agra, Uttar Pradesh 282 002, India;

    National Physical Laboratory, New Delhi 110012, India;

    Center for Electronic Correlations and Magnetism, Theoretical Physics Ⅲ, Institute of Physics, University of Augsburg, 86135 Augsburg, Germany;

    Department of Physics, Indian Institute of Technology Kharagpur, West Bengal 721302, India;

    Department of Physics, Indian Institute of Science, Bangalore 560012, India;

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