4.8 Article

Two-Dimensional Superconductivity at the LaAlO3/KTaO3(110) Heterointerface

Journal

PHYSICAL REVIEW LETTERS
Volume 126, Issue 2, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.026802

Keywords

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Funding

  1. National Key Research and Development Program of China [2016YFA0300204, 2017YFA0303002, 2018YFA0305704]
  2. National Natural Science Foundation of China [11934016, 52088101]
  3. Zhejiang Province Plan for Science and Technology [2020C01019]
  4. Fundamental Research Funds for the Central Universities of China
  5. Project for Innovative Research Team of National Natural Science Foundation of China [11921004]

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This report discusses the observation of superconductivity at the interface between LaAlO3 film and KTaO3 single crystal, suggesting a two-dimensional nature. The study provides estimates for carrier density, superconducting layer thickness, and coherence length.
We report on the observation of a T-c similar to 0.9 K superconductivity at the interface between LaAlO3 film and the 5d transition metal oxide KTaO3(110) single crystal. The interface shows a large anisotropy of the upper critical field, and its superconducting transition is consistent with a Berezinskii-Kosterlitz-Thouless transition. Both facts suggest that the superconductivity is two-dimensional (2D) in nature. The carrier density measured at 5 K is similar to 7 x 10(13) cm(-2). The superconducting layer thickness and coherence length are estimated to be similar to 8 and similar to 30 nm, respectively. Our result provides a new platform for the study of 2D superconductivity at oxide interfaces.

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