发表机构
Institute of Physics, Kazan Federal University（喀山联邦大学物理研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究通过研磨和退火处理石墨纳米片，发现高密度褶皱缺陷与室温以上磁通捕获直接相关，表明褶皱区域可能是局部高温超导的来源。
AI 中文摘要
本文报告了在块体热解石墨经长时间研磨并在空气中于670 K退火后获得的石墨纳米片中，可能存在的局部高温超导现象。透射电子显微镜（TEM）图像分析表明，这种处理导致基面表面形成高密度褶皱型缺陷。样品表现出磁通捕获——超导的关键特征之一——该现象持续至390 K及以上。与此同时，未经研磨（未退火）的样品及在真空中退火的样品均表现出可忽略的磁通捕获，且其TEM图像中未发现褶皱。高密度褶皱阵列的出现与室温以上捕获磁通的检测之间的直接相关性强烈表明，褶皱区域是石墨中局部高温超导的来源。
英文摘要
The paper reports on a possible manifestation of local high-temperature superconductivity in graphite nanoflakes obtained from the bulk pyrolytic graphite by an extended grinding and subsequent annealing at 670 K in the air. Analysis of transmission electron microscopy (TEM) images shows that such treatment leads to a formation of high-density wrinkle-type defects at the basal-plane surface. The sample reveals the magnetic flux trapping - one of the key signatures of superconductivity - that persists up to 390 K and above. At the same time, both the as-ground (unannealed) and annealed in the vacuum samples manifest negligible flux trapping, and no wrinkles in their TEM images were found. The direct correlation between the appearance of high-density wrinkle arrays and the detection of the trapped magnetic flux above the room temperature strongly suggests that wrinkled regions serve a source of local high-temperature superconductivity in graphite.
