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arXiv 1406.7422cond-mat.supr-concond-mat.stat-mech
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弱钉扎型II超导体Co0.0075 NbSe 2中涡旋晶格的两步无序

Two step disordering of the vortex lattice across the peak effect in a weakly pinned Type II superconductor, Co0.0075NbSe2

Somesh Chandra Ganguli, Harkirat Singh, Garima Saraswat, Rini Ganguly, Vivas Bagwe, Parasharam Shirage, Arumugam Thamizhavel, Pratap Raychaudhuri

摘要:

II型超导体中的涡旋晶格提供了一个通用的模型系统来研究存在随机钉扎的周期性介质中的有序-无序转变。在这里,使用扫描隧道光谱在弱钉扎Co0.0075NbSe2单晶,我们表明,在低温下,在一个3维超导体的涡旋晶格的障碍,在两个步骤中的峰值效应。在峰值效应开始时,平衡布拉格玻璃通过位错的扩散转变为取向玻璃。在较高的磁场下,位错解离成孤立的向错,产生非晶涡旋玻璃。我们还表明存在各种额外的非平衡亚稳态,这可以通过不同的热磁循环访问。

英文摘要:

The vortex lattice in a Type II superconductor provides a versatile model system to investigate the order-disorder transition in a periodic medium in the presence of random pinning. Here, using scanning tunnelling spectroscopy in a weakly pinned Co0.0075NbSe2 single crystal, we show that at low temperatures, the vortex lattice in a 3-dimensional superconductor disorders in two steps across the peak effect. At the onset of the peak effect, the equilibrium Bragg glass transforms into an orientational glass through the proliferation of dislocations. At a higher field, the dislocations dissociate into isolated disclination giving rise to an amorphous vortex glass. We also show the existence of a variety of additional non-equilibrium metastable states, which can be accessed through different thermomagnetic cycling.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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