Data related to "Inverse melting and re-entrant transformations of the vortex lattice in amorphous Re6Zr thin film"

This work reports the Inverse Melting of the vortex lattice in a 20 nm thick superconducting Re6Zr thin film, through direct imaging of the vortex lattice using low-temperature scanning tunneling spectroscopy and complementary transport measurements. The central result is that in a superconducting thin film with moderate vortex pinning, vortices form an inhomogeneous liquid at low temperatures and magnetic field and gradually transform to a nearly perfect crystalline solid as the magnetic field or temperature is increased, before melting into a liquid again at higher magnetic fields or temperature. This is qualitatively summarised in "raw_image_addition.png". Here, in each panel, we have added a sequence of 20 successive conductance maps acquired in the same area. In each conductance map the more probable locations for vortices appear as local conductance minima. When the vortices are moving, these minima appear at different locations in each image and the contrast becomes poor in the added image. At 460 mK, we observe a gradual evolution from an inhomogeneous vortex liquid to a vortex solid from 3 kOe to 20 kOe, and a gradual melting of this vortex solid again at higher fields. Similarly, at 3 kOe the inhomogeneous vortex liquid gradually crystallises between 460 mK to 3 K and then melts again at 4K. raw_image_addition.png is created by adding the intensities of 20 conductance maps acquired in the same area. A constant background conductance has been subtracted from each image. All images are plotted with the same relative conductance scale.The STS raw data used in creating "raw_image_addition.png" and in Figures 1, 2, and 3 of the paper are given in *.sxm format. The files numbered 001 to 020 in each subfolder denote the sequence of conductance maps acquired successively over the same area at a given magnetic field and temperature. The data in subfolder "Fig 1 and 2" are at 460 mK.The transport data (processed and unprocessed) are given as *.opju file and classified into subfolders named as per the corresponding figures in the paper.本工作针对厚度为20 nm的超导Re6Zr薄膜，利用低温扫描隧道谱（low-temperature scanning tunneling spectroscopy, STS）直接成像涡旋晶格（vortex lattice），并结合配套输运测量，报道了该体系中涡旋晶格的逆熔化现象。核心研究结果表明：在具有适度涡旋钉扎的超导薄膜中，涡旋会在低温与低磁场条件下形成非均匀涡旋液相；随着磁场或温度升高，涡旋会逐渐转变为近乎完美的结晶固相；而当磁场或温度进一步升高时，固相会再次熔化为液相。该现象的定性总结详见"raw_image_addition.png"。 该图中每个子图均由同一区域连续采集的20幅电导图叠加而成。在单幅电导图中，涡旋更大概率出现的位置表现为局域电导极小值。当涡旋处于运动状态时，这些极小值会在不同图像中出现在不同位置，叠加后的图像对比度会随之降低。在460 mK条件下，我们观测到当磁场从3 kOe升高至20 kOe时，涡旋从非均匀液相逐步演化为固相，而当磁场进一步升高时，该涡旋固相会再次逐渐熔化。类似地，在3 kOe条件下，当温度从460 mK升高至3 K时，非均匀涡旋液相会逐步结晶，随后在4 K时再次熔化。 raw_image_addition.png通过将同一区域采集的20幅电导图的强度叠加得到，每幅图像均已扣除恒定的背景电导值，所有图像均采用统一的相对电导标尺进行绘制。用于制作"raw_image_addition.png"以及论文中图1、2、3的STS原始数据均以*.sxm格式存储。每个子文件夹中编号为001至020的文件，对应给定磁场与温度条件下在同一区域连续采集的电导图序列。其中"Fig 1 and 2"子文件夹中的数据采集于460 mK条件下。 输运数据（包括处理后与未处理的原始数据）以*.opju格式存储，并按照论文中对应图表的名称分类至不同子文件夹中。