Superconductivity at epitaxial LaTiO3-KTaO3 interfaces
arXiv:2305.08304 · doi:10.1063/5.0151227
Abstract
Design of epitaxial interfaces is a pivotal way to engineer artificial structures where new electronic phases can emerge. Here we report a systematic emergence of interfacial superconducting state in epitaxial heterostructures of LaTiO3 and KTaO3. The superconductivity transition temperature increases with decreasing the thickness of LaTiO3. Such behavior is observed for both (110) and (111) crystal oriented structures. For thick samples, the finite resistance developing below the superconducting transition temperature increases with increasing LaTiO3 thickness. Consistent with previous reports, the (001) oriented heterointerface features high electron mobility of 250 cm2/Vs and shows no superconducting transition down to 40 mK. Our results imply a non-trivial impact of LaTiO3 on the superconducting state and indicate how superconducting KTaO3 interfaces can be integrated with other oxide materials.
arXiv commentaccepted in APL Materials
References in corpus (25)
- Why Some Interfaces Cannot be Sharp
- Electric Field Control of the LaAlO/SrTiO Interface Ground State
- Tunable Rashba spin-orbit interaction at oxide interfaces
- Superconducting 2D system with lifted spin degeneracy: Mixed singlet-triplet state
- Tuning spin-orbit coupling and superconductivity at the SrTiO3/LaAlO3 interface: a magneto-transport study
- Two-dimensional superconductivity at a Mott-Insulator/Band-Insulator interface: LaTiO3/SrTiO3
- Discovery of two-dimensional anisotropic superconductivity at KTaO (111) interfaces
- Two-dimensional superconductivity at the surfaces of KTaO3 gated with ionic liquid
- Lattice relaxation, electronic screening, and spin and orbital phase diagram of LaTiO/SrTiO superlattices
- Electrostatic carrier doping of GdTiO3/SrTiO3 interfaces
- Polar Discontinuity Doping of the LaVO_3/SrTiO_3 Interface
- LaAlO3 stoichiometry found key to electron liquid formation at LaAlO3/SrTiO3 interfaces
- Topological superconductivity in bilayer Rashba system
- Electric field control of disorder-tunable superconductivity and the emergence of quantum metal at an oxide interface
- Odd-parity superconductivity in the vicinity of inversion symmetry breaking in spin-orbit-coupled systems
- Observation of two-dimensional superconductivity at the LaAlO3/KTaO3(110) heterointerface
- Anisotropic two-dimensional electron gas at SrTiO3(110) protected by its native overlayer
- Unexpected Anisotropic Two Dimensional Electron Gas at the LaAlO3/SrTiO3 (110) Interface
- Topological superconductivity and unconventional pairing in oxide interfaces
- Pairing states of spin-3/2 fermions: Symmetry-enforced topological gap functions
- Tunable superconductivity at the oxide-insulator/KTaO interface and its origin
- Superfluid stiffness of a KTaO3-based two-dimensional electron gas
- Stoichiometry control of the electronic properties of the LaAlO_3/SrTiO_3 heterointerface
- The Mott insulator LaTiO_3 in heterostructures with SrTiO_3 is metallic
- Coexistence of superconductivity and weak anti-localization at KTaO3 (111) interfaces