Two-dimensional superconductivity at a Mott-Insulator-Band-Insulator interface: LaTiO3-SrTiO3 - Condensed Matter > SuperconductivityReport as inadecuate




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Abstract: Transition metal oxides display a great variety of quantum electronicbehaviours where correlations often play an important role. The achievement ofhigh quality epitaxial interfaces involving such materials gives a uniqueopportunity to engineer artificial structures where new electronic orders takeplace. One of the most striking result in this area is the recent observationof a two-dimensional electron gas at the interface between a stronglycorrelated Mott insulator LaTiO3 and a band insulator SrTiO3. The mechanismresponsible for such a behaviour is still under debate. In particular, theinfluence of the nature of the insulator has to be clarified. Here we show thatdespite the expected electronic correlations, LaTiO3-SrTiO3 heterostructuresundergo a superconducting transition at a critical temperature Tc=300 mK. Wehave found that the superconducting electron gas is confined over a typicalthickness of 12 nm. We discuss the electronic properties of this system andreview the possible scenarios.



Author: Johan Biscaras, Nicolas Bergeal, Akhilesh Kushwaha, Thomas Wolf, Ankur Rastogi, Ramesh Chandra Budhani, Jerome Lesueur

Source: https://arxiv.org/



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