Effects of growth temperature, oxygen pressure, laser fluence and postannealing on transport properties of superconducting LaAlO3/KTaO3(111) interfaces

Review Chemistry, Multidisciplinary

KTaO3-The New Kid on the Spintronics Block

Anshu Gupta et al.

Summary: This article discusses the research progress and future application prospects of KTaO3, an oxide material. This material has excellent physical properties and potential applications, and has attracted widespread attention.

ADVANCED MATERIALS (2022)

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Review Nanoscience & Nanotechnology

Oxide spin-orbitronics: spin-charge interconversion and topological spin textures

Felix Trier et al.

Summary: Oxide materials exhibit a wide range of functional properties, where electron correlations and spin-orbit coupling play significant roles. Recent advances in oxide spin-orbitronics have led to the realization of exotic phenomena and new functionalities for spintronics applications. The future prospects for this field involve further exploration of spin-charge interconversion, topological spin textures, and the influence of ferroelectricity on spin-orbit-driven effects.

NATURE REVIEWS MATERIALS (2022)

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Article Multidisciplinary Sciences

Superfluid stiffness of a KTaO3-based two-dimensional electron gas

S. Mallik et al.

Summary: Heterostructures based on (111)-oriented KTaO(3) crystals provide a new platform for studying oxide interfaces, and gate-tunable superconductivity in 2D electron gases has been reported. The superconducting transition on (111)-oriented KTaO3 surfaces follows the Berezinskii-Kosterlitz-Thouless scenario, which is different from SrTiO3-based interfaces.

NATURE COMMUNICATIONS (2022)

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Article Multidisciplinary Sciences

Two-dimensional superconductivity at the surfaces of KTaO3 gated with ionic liquid

Tianshuang Ren et al.

Summary: The recent discovery of superconductivity at the interfaces between KTaO3 and EuO (or LaAlO3) has led to the development of the second generation of oxide interface superconductors. This superconductivity is strongly influenced by the surface plane of KTaO3, unlike the previous LaAlO3/SrTiO3 interface, and the superconducting transition temperature Tc has been increased significantly. By utilizing ionic liquid (IL) gating, superconductivity has been achieved at the KTaO3(111) and KTaO3(110) surfaces, with Tc values of up to 2.0 K and 1.0 K respectively. This oxide-IL interface superconductivity provides clear evidence that the essential physics of KTaO3 interface superconductivity lies in the KTaO3 surfaces doped with electrons. Furthermore, the use of IL technique allows for better control and study of the intrinsic superconductivity in KTaO3.

SCIENCE ADVANCES (2022)

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Article Materials Science, Multidisciplinary

Emergence of high-temperature superconductivity at the interface of two Mott insulators

Lele Ju et al.

Summary: We report the observation of high-temperature superconductivity in a new type of heterostructure, which consists of two Mott insulators and is controlled by doping and oxidization conditions. The study found that superconductivity occurs in a small region and may be attributed to the redistribution of oxygen.

PHYSICAL REVIEW B (2022)

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Article Quantum Science & Technology

Unique Signatures of Rashba Effect in Angle Resolved Magnetoresistance

Anshu Gupta et al.

Summary: An unusual dependence of electrical resistance on the direction of the magnetic field has been reported in a 2D electron gas with strong spin-orbit coupling at the LaVO3-KTaO3 interface. The observations are incompatible with previously reported magneto-transport measurements. The quantum effects from spin-orbit coupling play a key role in controlling the unusual features in transport.

ADVANCED QUANTUM TECHNOLOGIES (2022)

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Article Physics, Multidisciplinary

Two-Dimensional Superconductivity at the LaAlO3/KTaO3(110) Heterointerface

Zheng Chen et al.

Summary: This report discusses the observation of superconductivity at the interface between LaAlO3 film and KTaO3 single crystal, suggesting a two-dimensional nature. The study provides estimates for carrier density, superconducting layer thickness, and coherence length.

PHYSICAL REVIEW LETTERS (2021)

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Article Multidisciplinary Sciences

Two-dimensional superconductivity and anisotropic transport at KTaO3 (111) interfaces

Changjiang Liu et al.

Summary: The study discovers superconductivity in electron gases formed at interfaces between certain materials, with a relatively high superconducting transition temperature and clear two-dimensional superconductivity. In some samples, a spontaneous in-plane transport anisotropy is observed before the onset of superconductivity, indicating the emergence of a distinct stripe-like phase.

SCIENCE (2021)

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Article Multidisciplinary Sciences

Electric field control of superconductivity at the LaAlO3/KTaO3(111) interface

Zheng Chen et al.

Summary: The study shows that the superconducting state at the oxide interface between LaAlO3 and KTaO3(111) can be tuned by applying a gate voltage across KTaO3, resulting in a dome-shaped dependence of transition temperature on gate voltage. The electric gating affects mobility more than carrier density. As the temperature decreases, the resistance saturates at the lowest temperature on both superconducting and insulating sides, indicating the emergence of a quantum metallic state associated with a failed superconductor and/or fragile insulator.

SCIENCE (2021)

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Article Chemistry, Multidisciplinary

Spin-Charge Interconversion in KTaO3 2D Electron Gases

Luis M. Vicente-Arche et al.

Summary: Oxide interfaces exhibit a broad range of physical effects due to broken inversion symmetry, including non-reciprocal phenomena. The observation of both the DEE and IEE in a new interfacial 2DEG based on the perovskite oxide KTaO3 has been reported.

ADVANCED MATERIALS (2021)

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Article Physics, Multidisciplinary

Critical Thickness in Superconducting LaAlO3/KTaO3 (111) Heterostructures

Yanqiu Sun et al.

Summary: Recent research discovered a critical thickness of around 3 nm for LaAlO3 film on the LaAlO3/KTaO3 (111) interface, beyond which the interface behaves as insulating rather than conducting (or superconducting). In situ transport measurements during growth also revealed that this critical thickness can be suppressed by avoiding exposure to oxygen. These findings suggest that the origin of the electron gas at the interface is dominated by electron transfer from oxygen vacancies in the LaAlO3 film to the KTaO3 substrate.

PHYSICAL REVIEW LETTERS (2021)

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Article Multidisciplinary Sciences