论文标题
横跨Berezinskii Kosterlitz的通量流动不稳
Flux-flow instability across Berezinskii Kosterlitz Thouless phase transition in KTaO$_3$ (111) based superconductor
论文作者
论文摘要
在过去的二十年中，已经对垂直磁场下2D超导体的能量耗散性质进行了广泛的研究。但是，高电流驱动器处的耗散机制在很大程度上尚未探索。在这里，我们报告了在Alox/KTAO $ _3 $（111）系统中托管2D超导率在中等疾病制度中的独特行为。结果表明，在Berezinskii Kosterlitz Thouless（BKT）相过渡温度（$ T_ \ Mathrm {bkt} $），热点和Larkin Ovchinnikov Type type flux-flux-flowOwOWOWOWNOBIITION（FFI）是耗散的主要渠道，导致了大型Voltage Instability instable in actrentability inst actrents in ligal Comerents。此外，这种FFI导致在温度范围内的电流特性中罕见地观察到顺时针滞后$ T_ \ MATHRM {bkt} <t <t <t <t <t <t <t <t <t_ \ mathrm {c} $（$ t_ \ t_ \ mathrm {c} $是超构成过渡温度）。这些发现加深了我们对BKT系统在增加电流下如何最终转变为正常状态的理解。
The nature of energy dissipation in 2D superconductors under perpendicular magnetic field at small current excitations has been extensively studied over the past two decades. However, dissipation mechanisms at high current drives remain largely unexplored. Here we report on the distinct behavior of energy dissipation in the AlOx/KTaO$_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.
