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arXiv 0903.2389cond-mat.supr-con
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实空间涡旋玻璃成像及SnMo6S8的涡旋phase diagram

Real-space vortex glass imaging and the vortex phase diagram of SnMo6S8

A. P. Petrovic, Y. Fasano, R. Lortz, C. Senatore, A. Demuer, A. B. Antunes, A. Paré, D. Salloum, P. Gougeon, M. Potel, Ø. Fischer

摘要:

利用400 mK的扫描隧道显微镜,我们获得了2 - 9 T范围内SnMo_6S_8中约100个涡旋的分布图。在5和9 T的取向和位置无序表明,这些是第一个大规模的图像的涡旋玻璃。在较高的温度下,观察到磁化峰效应,其上边界与比热中的λ异常相一致。我们的数据有利于动力学玻璃描述的涡旋熔化过渡,表明涡旋拓扑紊乱持续在领域和温度远低于峰值效应在低Tc超导体。

英文摘要:

Using scanning tunnelling microscopy at 400mK, we have obtained maps of around 100 vortices in SnMo6S8 from 2 - 9T. The orientational and positional disorder at 5 and 9T show that these are the first large-scale images of a vortex glass. At higher temperature a magnetisation peak effect is observed, whose upper boundary coincides with a lambda anomaly in the specific heat. Our data favour a kinetic glass description of the vortex melting transition, indicating that vortex topological disorder persists at fields and temperatures far below the peak effect in low-Tc superconductors.

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