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首页> 外文期刊>Physical review >Imaging the effect of drive on the low-field vortex melting phenomenon in a Ba_(0.6)K_(0.4)Fe_2As_2 single crystal
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Imaging the effect of drive on the low-field vortex melting phenomenon in a Ba_(0.6)K_(0.4)Fe_2As_2 single crystal

机译：在BA_（0.6）K_（0.4）FE_2AS_2单晶中的低场Vortex熔化现象上成像驱动对低场涡旋熔化现象的影响

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摘要

Self-field imaging of current distribution in the Ba_(0.6)K_(0.4)Fe_2As_2 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 low field glassy vortex (solid) phase, 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 whereas, below 50 mA, an effective temperature concept for the 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.
机译：BA_（0.6）K_（0.4）FE_2AS_2超导体中电流分布的自场成像用于研究驱动对低场涡旋固体与液体熔化相变的影响。在低场，涡流上的电流诱导的驱动器有助于热稳定低场玻璃涡流（固体）相，从而使低场熔化相位边界移位。我们表明，与平衡情况相比，电流诱导的驱动器移位固态界限并使涡旋熔化现象。分析表明，对于50 mA高于50 mA的电流，焦耳加热效果将熔化线移位，而低于50 mA，为驱动系统的有效温度概念。驱动依赖性振荡温度，解释了转变。作为驱动力的函数的诸如驱动力的函数的在低场中的样品中不均匀地在样品中的变换的观察通过摇动温度对涡流的逆依赖性来协调。

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  • 来源
    《Physical review》 |2020年第18期|184516.1-184516.5|共5页
  • 作者

    Ankit Kumar; Amit Jash; Tsuyoshi Tamegai; S. S. Banerjee;

  • 作者单位

    Department of Physics Indian Institute of Technology Kanpur 208016 India;

    Department of Physics Indian Institute of Technology Kanpur 208016 India;

    Department of Applied Physics The University of Tokyo Hongo Bunkyo-ku Tokyo 113-8656 Japan;

    Department of Physics Indian Institute of Technology Kanpur 208016 India;

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