Correlated non-Gaussian phase fluctuations in LaAlO3/SrTiO3 heterointerfaces

Daptary, Gopi Nath and Kumar, Shelender and Kumar, Pramod and Dogra, Anjana and Mohanta, N and Taraphder, A and Bid, Aveek (2016) Correlated non-Gaussian phase fluctuations in LaAlO3/SrTiO3 heterointerfaces. In: PHYSICAL REVIEW B, 94 (8).

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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 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.

Item Type:	Journal Article
Publication:	PHYSICAL REVIEW B
Additional Information:	Copy right for this article belongs to the AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	22 Oct 2016 09:23
Last Modified:	22 Oct 2016 09:23
URI:	http://eprints.iisc.ac.in/id/eprint/55024

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