Correlated non-Gaussian phase fluctuations in LaAlO3/SrTiO3 heterointerfaces

Gopi Nath Daptary, Shelender Kumar, Pramod Kumar, Anjana Dogra, N. Mohanta, A. Taraphder, and Aveek Bid
Phys. Rev. B 94, 085104 – Published 4 August 2016

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 TBKT and the mean-field transition temperature TC. 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.

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  • Received 6 January 2016
  • Revised 14 July 2016

DOI:https://doi.org/10.1103/PhysRevB.94.085104

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Gopi Nath Daptary1, Shelender Kumar1, Pramod Kumar2,*, Anjana Dogra2, N. Mohanta3, A. Taraphder4, and Aveek Bid1,†

  • 1Department of Physics, Indian Institute of Science, Bangalore 560012, India
  • 2National Physical Laboratory, New Delhi 110012, India
  • 3Center for Electronic Correlations and Magnetism, Theoretical Physics III, Institute of Physics, University of Augsburg, 86135 Augsburg, Germany
  • 4Department of Physics, Indian Institute of Technology Kharagpur, West Bengal 721302, India

  • *Present address: Department of Physics, St. John's College, Agra, Uttar Pradesh 282 002, India.
  • aveek.bid@physics.iisc.ernet.in

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Issue

Vol. 94, Iss. 8 — 15 August 2016

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