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.

51 pages including supplemental

References in corpus (10)

• Imaging of super-fast dynamics and flow instabilities of superconducting vortices
• Dynamics of vortex penetration, jumpwise instabilities and nonlinear surface resistance of type-II superconductors in strong rf fields
• 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
• Effects of spin-orbit coupling on the Berezinskii-Kosterlitz-Thouless transition and the vortex-antivortex structure in two-dimensional Fermi gases
• Inhomogeneous multi-carrier superconductivity at LaXO3/SrTiO3 (X=Al or Ti) oxide interfaces
• Oxygen Vacancy-Induced Topological Hall effect in a Nonmagnetic Band Insulator
• Dynamical vortex phase diagram of 2D superconductivity in gated MoS2
• Electron trapping and detrapping in an oxide two-dimensional electron gas: The role of ferroelastic twin walls

Cited by in corpus (5)

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• 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