Superconductivity in epitaxially grown LaVO3/KTaO3(111) heterostructures

Abstract

Complex oxide heterointerfaces can host a rich of emergent phenomena, and epitaxial growth is usually at the heart of forming these interfaces. Recently, a strong crystalline-orientation-dependent two-dimensional superconductivity was discovered at interfaces between KTaO3 single-crystal substrates and films of other oxides. Unexpectedly, rare of these oxide films was epitaxially grown. Here, we report the existence of superconductivity in epitaxially grown LaVO3/KTaO3(111) heterostructures, with a superconducting transition temperature of ~0.5 K. Meanwhile, no superconductivity was detected in the (001)- and (110)-orientated LaVO3/KTaO3 heterostructures down to 50 mK. Moreover, we find that for the LaVO3/KTaO3(111) interfaces to be conducting, an oxygen-deficient growth environment and a minimum LaVO3 thickness of ~0.8 nm (~ 2 unit cells) are needed.

5 figures, plus 6 supplementary figures

References in corpus (9)

• Magnetic effects at the interface between nonmagnetic oxides
• Electric Field Control of the LaAlO${}_3$/SrTiO${}_3$ Interface Ground State
• Origin of charge density at LaAlO3-on-SrTiO3 hetero-interfaces; possibility of intrinsic doping
• High-temperature interface superconductivity between metallic and insulating cuprates
• Two-dimensional superconductivity at the surfaces of KTaO3 gated with ionic liquid
• Superconductor-metal quantum transition at the EuO-KTaO3 interface
• Geometrical lattice engineering of complex oxide heterostructures: a designer approach to emergent quantum states
• Coexistence of superconductivity and weak anti-localization at KTaO3 (111) interfaces
• Emergence of high-temperature superconductivity at the interface of two Mott insulators

Cited by in corpus (1)

• Revealing subterahertz atomic vibrations in quantum paraelectrics by surface-sensitive spintronic terahertz spectroscopy