Flux-flow instability across Berezinskii Kosterlitz Thouless phase transition in KTaO${}_3$ (111) based superconductor

Abstract

The nature of energy dissipation in 2D superconductors under perpendicular magnetic field at small current excitations has been extensively studied over the past two decades. However, dissipation mechanisms at high current drives remain largely unexplored. Here we report on the distinct behavior of energy dissipation in the AlOx/KTaO${}_3$ (111) system hosting 2D superconductivity in the intermediate disorder regime. The results show that below the Berezinskii Kosterlitz Thouless (BKT) phase transition temperature ($T_{\mathrm{BKT}}$), hot-spots and Larkin Ovchinnikov type flux-flow instability (FFI) are the major channels of dissipation, leading to pronounced voltage instability at large currents. Furthermore, such FFI leads to a rare observation of clockwise hysteresis in current-voltage characteristics within the temperature range $T_{\mathrm{BKT}}<T<T_{\mathrm{C}}$ ($T_{\mathrm{C}}$ is superconducting transition temperature). These findings deepen our understanding of how a BKT system ultimately transforms to a normal state under increasing current.

arXiv comment51 pages including supplemental

References in corpus (29)

• Experimental Observation of the Quantum Anomalous Hall Effect in a Magnetic Topological Insulator
• Granular Electronic Systems
• Interface engineering of quantum Hall effects in digital transition metal oxide heterostructures
• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• Two-dimensional superconductivity at a Mott-Insulator/Band-Insulator interface: LaTiO3/SrTiO3
• Discovery of two-dimensional anisotropic superconductivity at KTaO${}_3$ (111) interfaces
• Two-dimensional superconductivity at the surfaces of KTaO3 gated with ionic liquid
• Imaging of super-fast dynamics and flow instabilities of superconducting vortices
• Anomalous metals -- failed superconductors
• Electric field control of disorder-tunable superconductivity and the emergence of quantum metal at an oxide interface
• Clean 2D superconductivity in a bulk van der Waals superlattice
• Ultra-fast vortex motion in dirty Nb-C superconductor with a close-to-perfect edge barrier
• Dynamics of vortex penetration, jumpwise instabilities and nonlinear surface resistance of type-II superconductors in strong rf fields
• The density and disorder tuned superconductor-metal transition in two dimensions
• Unstable flux flow due to heated electrons in YBaCuO films
• Intrinsic instability of electronic interfaces with strong Rashba coupling
• Tunable superconductivity at the oxide-insulator/KTaO${}_3$ interface and its origin
• Superfluid stiffness of a KTaO3-based two-dimensional electron gas
• Multi-band superconductivity and nanoscale inhomogeneity at oxide interfaces
• Oxygen vacancy induced electronic structure modification of KTaO${}_3$
• Effects of spin-orbit coupling on the Berezinskii-Kosterlitz-Thouless transition and the vortex-antivortex structure in two-dimensional Fermi gases
• Absence of dissipationless transport in clean 2D superconductors
• Phase slip lines in superconducting few-layer NbSe${}_2$ crystals
• Inhomogeneous multi-carrier superconductivity at LaXO3/SrTiO3 (X=Al or Ti) oxide interfaces
• Oxygen Vacancy-Induced Topological Hall effect in a Nonmagnetic Band Insulator
• Electron trapping and detrapping in an oxide two-dimensional electron gas: The role of ferroelastic twin walls
• Dynamical vortex phase diagram of 2D superconductivity in gated MoS2
• Robust anomalous metallic states and vestiges of self duality in two-dimensional granular In-InOx composites
• History effect in inhomogeneous superconductors

Cited by in corpus (5)

• Quantum fluctuations lead to glassy electron dynamics in the good metal regime of electron doped KTaO3
• Superconducting quantum oscillations and anomalous negative magnetoresistance in a honeycomb nanopatterned oxide interface superconductor
• Beyond being free: glassy dynamics of SrTiO${}_3$-based two-dimensional electron gas
• Two-dimensional superconducting diode effect in topological insulator/superconductor heterostructure
• Geometric Asymmetry-Enhanced Nonreciprocal Supercurrent Transport Revealed by Second-Harmonic Response