Correlated non-Gaussian phase fluctuations in LaAlO3/SrTiO3 heterointerfaces

Article

关键词: 2-DIMENSIONAL SUPERCONDUCTORS;    1/F NOISE;    RESISTIVE TRANSITION;    COULOMB-GAS;    FILMS;    INTERFACE;    HETEROSTRUCTURES;    YBA2CU3O7-DELTA;    THICKNESS;    STATE;   

DOI  :  10.1103/PhysRevB.94.085104

来源: SCIE

【 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 LaAlO3/SrTiO3 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.

【 授权许可】

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