论文标题
成像驱动器对BA0.6K0.4FE2AS2单晶中低场涡流熔化现象的影响
Imaging the effect of drive on the low-field vortex melting phenomenon in Ba0.6K0.4Fe2As2 single crystal
论文作者
论文摘要
BA0.6K0.4FE2AS2超导体中电流分布的自场成像用于研究驱动器对低场涡流固体对液体熔化相变的影响。在低场上，涡流上电流诱导的驱动有助于对涡旋状态的热稳定，从而改变了低场熔化相边界。我们表明，与平衡情况相比，当前诱导的驱动器会移动固定液边界，并预言涡流熔化现象。分析表明，对于高于50 mA的电流，焦耳的加热效果移动了熔融线，而低于50 mA，这是驱动系统的有效温度概念，即驱动因素的摇动温度，解释了转移。通过摇动温度对涡旋速度的逆依赖性，对驱动力的函数的样品中从不均匀到均相电流流的转化进行了观察，该转化已核对，这纳入了我们的分析中。
Self-field imaging of current distribution in Ba0.6K0.4Fe2As2 superconductor is used to study the effect of drive on the low-field vortex solid to liquid melting phase transformation. At low fields, the current induced drive on the vortices aids in thermally destabilizing the vortex state thereby shifting the low field melting phase boundary. We show that the current induced drive shifts solid-liquid boundaries and prepones the vortex melting phenomenon compared to the equilibrium situation. The analysis shows that for currents above 50 mA, Joule heating effects shift the melting line while below 50 mA, an effective temperature concept for driven system viz., a drive dependent shaking temperature, explains the shift. The observation of a transformation from inhomogeneous to homogeneous current flow in the sample at low fields as a function of the driving force is reconciled via an inverse dependence of the shaking temperature on vortex velocity, which is incorporated in our analysis.
