Superconductivity in epitaxially grown LaVO3/KTaO3(111) heterostructures
arXiv:2208.05712 · doi:10.1088/1674-1056/acac1b
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.
arXiv comment5 figures, plus 6 supplementary figures
References in corpus (20)
- Magnetic effects at the interface between nonmagnetic oxides
- Why Some Interfaces Cannot be Sharp
- Electric Field Control of the LaAlO/SrTiO Interface Ground State
- Direct imaging of the coexistence of ferromagnetism and superconductivity at the LaAlO3/SrTiO3 interface
- Coexistence of Magnetic Order and Two-dimensional Superconductivity at LaAlO/SrTiO Interfaces
- Origin of charge density at LaAlO3-on-SrTiO3 hetero-interfaces; possibility of intrinsic doping
- High-temperature interface superconductivity between metallic and insulating cuprates
- A polarity-induced defect mechanism for conductivity and magnetism at polar-nonpolar oxide interfaces
- Discovery of two-dimensional anisotropic superconductivity at KTaO (111) interfaces
- Two-dimensional superconductivity at the surfaces of KTaO3 gated with ionic liquid
- Origin of the two-dimensional electron gas at LaAlO3/SrTiO3 interfaces: The role of oxygen vacancies and electronic reconstruction
- Electric field control of disorder-tunable superconductivity and the emergence of quantum metal at an oxide interface
- Observation of two-dimensional superconductivity at the LaAlO3/KTaO3(110) heterointerface
- Planar Hall Effect and Anisotropic Magnetoresistance in a polar-polar interface of LaVO-KTaO with strong spin-orbit coupling
- Gate-controlled low carrier density superconductors: Toward the two-dimensional BCS-BEC crossover
- Superconductor-metal quantum transition at the EuO-KTaO3 interface
- Origin of interfacial conductivity at complex oxide heterointerfaces: possibility of electron transfer from water chemistry at surface oxygen vacancies
- 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