Correlated Non-Gaussian phase fluctuations in LaAlO$_3$/SrTiO$_3$ heterointerface

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

doi:10.1103/PhysRevB.94.085104

Correlated Non-Gaussian phase fluctuations in LaAlO$_3$/SrTiO$_3$ heterointerface

Superconductivity 2016-08-08 v1

Authors: Gopi Nath Daptary , Shelender Kumar , Pramod Kumar , Anjana Dogra , N. Mohanta , A. Taraphder , Aveek Bid

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Abstract

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.

Keywords

non-Gaussian phase fluctuations LaAlO3/SrTiO3 heterointerface superconducting phase transition Berezinskii-Kosterlitz-Thouless transition Josephson coupled network percolative transition two-dimensional superconductivity

Cite

@article{arxiv.1608.01927,
  title  = {Correlated Non-Gaussian phase fluctuations in LaAlO$_3$/SrTiO$_3$ heterointerface},
  author = {Gopi Nath Daptary and Shelender Kumar and Pramod Kumar and Anjana Dogra and N. Mohanta and A. Taraphder and Aveek Bid},
  journal= {arXiv preprint arXiv:1608.01927},
  year   = {2016}
}

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10 pages, 12 figures

Correlated Non-Gaussian phase fluctuations in LaAlO$_3$/SrTiO$_3$ heterointerface

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