Jukna Artūras
Photovoltaic Technologies Laboratory, Vilnius Gediminas Technical University, Sauletekio av. 3, LT-10257 Vilnius, Lithuania.
Materials (Basel). 2022 Jun 16;15(12):4260. doi: 10.3390/ma15124260.
Energy dissipation from vortex motion, which appears as a resistivity of the mixed-state superconductor, limits the range of type II superconductors in low- and high-power electronics and optoelectronics. The level of dissipation increases with the development of the vortex motion phase from that of the thermally activated flux flow to that of the flux creep and finally to that of the flux flow. The vortex motion regimes depend on the balance between bias current-self-produced Lorentz force, accelerating vortices, and the pinning force, which, together with a magnetic drag force from pinned vortices, tends to stop the vortex motion. The current paper reports on energy dissipation in YBaCuO (YBCO) devices provided with partially deoxygenated structures mutually interacting by magnetic force with one another. The shape of the structure and the magnetic interaction between the trapped and moving vortices, as well as the magnetic interaction between neighboring structures, can cause the appearance of voltage steps in the device's current-voltage characteristics observed in temperature range 0.94 ≥ / ≥ 0.98 (here, = 91.4 K is the temperature of the superconducting transition in the YBCO material). Current findings demonstrate the potential of artificial structures to control vortex motion in a mixed-state YBCO superconductor by means of a temperature, bias current, and a specific configuration of the structure itself and a profile of the oxygen distribution in it.
涡旋运动产生的能量耗散表现为混合态超导体的电阻率，它限制了II型超导体在低功率和高功率电子学以及光电子学中的应用范围。随着涡旋运动阶段从热激活磁通流发展到磁通蠕动，最终发展到磁通流，耗散水平会增加。涡旋运动状态取决于偏置电流自生的洛伦兹力（加速涡旋）与钉扎力之间的平衡，钉扎力与来自被钉扎涡旋的磁阻力一起，倾向于阻止涡旋运动。本文报道了具有部分脱氧结构且相互通过磁力相互作用的YBaCuO（YBCO）器件中的能量耗散情况。结构的形状、捕获和移动涡旋之间的磁相互作用以及相邻结构之间的磁相互作用，会导致在0.94≥T/Tc≥0.98的温度范围内观察到器件电流-电压特性中出现电压台阶（这里，Tc = 91.4 K是YBCO材料中超导转变温度）。当前研究结果表明，人工结构具有通过温度、偏置电流以及结构本身的特定配置和其中氧分布轮廓来控制混合态YBCO超导体中涡旋运动的潜力。
