Journal
PHYSICAL REVIEW LETTERS
Volume 126, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.026802
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Funding
- National Key Research and Development Program of China [2016YFA0300204, 2017YFA0303002, 2018YFA0305704]
- National Natural Science Foundation of China [11934016, 52088101]
- Zhejiang Province Plan for Science and Technology [2020C01019]
- Fundamental Research Funds for the Central Universities of China
- 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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