Unconventional Superconductivity at LaVO3/SrTiO3Interfaces

Halder, S and Garg, M and Mehta, NS and Kumari, A and Sharma, R and Das, T and Chakraverty, S and Sheet, G (2022) Unconventional Superconductivity at LaVO3/SrTiO3Interfaces. In: ACS Applied Electronic Materials .

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Abstract

The conducting interfaces of perovskite oxides are fertile playgrounds of diverse quantum phenomena, and they are potentially important for applications in superconducting nanoelectronic devices. We discovered that the interfaces between the Mott-insulator LaVO3 and the band-insulator SrTiO3 host two-dimensional superconductivity below Tc ≈ 250 mK. Our band structure calculations indicate that for these interfaces, multiple bands (the V and the Ti d bands) cross the Fermi energy where the V d electrons also carry a magnetic moment, thereby raising the possibility of an unconventional order parameter (OP) of the superconducting phase. We have fabricated subsurface soft metallic point-contacts at the LaVO3/SrTiO3 interfaces to probe the OP symmetry spectroscopically through the measurement of Andreev reflection. The spectroscopic features strongly deviate from the expectations within the conventional Bardeen-Cooper-Schriefer framework and support the existence of an unconventional order parameter.

Item Type:	Journal Article
Publication:	ACS Applied Electronic Materials
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to American Chemical Society.
Keywords:	Lanthanum compounds; Magnetic moments; Perovskite; Strontium titanates; Superconducting devices, Andreev reflection; Andreev reflection spectroscopy; Conducting interface; Mott insulators; Multiband superconductivity; Order parameter; Oxide 2DEG; Perovskite oxides; Reflection spectroscopy; Unconventional superconductivity, Mott insulators
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	09 Jan 2023 09:09
Last Modified:	09 Jan 2023 09:09
URI:	https://eprints.iisc.ac.in/id/eprint/78938

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