Superconductor-metal quantum transition at the EuO-KTaO3 interface

Abstract

Superconductivity has been one of the most fascinating quantum states of matter for over several decades. Among the superconducting materials, LaAlO3/SrTiO3 interface is of particularly interest since superconductivity exists between two insulating materials, which provides it with various unique applications compared with bulk superconductors and makes it a suitable platform to study the quantum Hall effect, charge density wave, superconductivity and magnetism in one device. Therefore, a lot of efforts have been made to search new superconducting oxide interface states with higher superconducting critical temperature (TC). Recently, a superconducting state with TC ~ 2 K has been found at the interface between a ferromagnetic insulator EuO and a band insulator (111)-KTaO3. Here, we report the experimental investigation of the superconductor-metal quantum phase transition of the EuO/KTaO3 interface. Around the transition, a divergence of the dynamical critical exponent is observed, which supports the quantum Griffiths singularity in the EuO/KTaO3 interface. The quantum Griffiths singularity could be attributed to large rare superconducting regions and quenched disorders at the interface. Our results could pave the way for studying the exotic superconducting properties at the EuO/KTaO3 interface.

arXiv commentMain paper: 12 pages, 4 figures. Supplementary materials: 3 figures

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Cited by in corpus (9)

• Tunable superconductivity at the oxide-insulator/KTaO${}_3$ interface and its origin
• Quantum phase transitions in two-dimensional superconductors: a review on recent experimental progress
• Gate-tunability of the superconducting state at the $EuO/KTa{O}_3(111)$ interface
• Two-Dimensional Electron Gas with High Mobility Forming at BaO/SrTiO3 Interface
• Superconductivity in epitaxially grown LaVO3/KTaO3(111) heterostructures
• Three-dimensional quantum Griffiths singularity in bulk iron-pnictide superconductors
• Surface charge writing and non-volatile control of superconductivity in LaAlO3/KTaO3(111) heterostructure
• Nematic order driven by superconducting correlations
• Observation of Quantum-Criticality-Class Crossover at the LaAlO${}_3$/KTaO${}_3$ (111) Interface