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arXiv 0708.3035cond-mat.mes-hall
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介观超导圆盘heat capacity的拓扑效应

Topology effects on the heat capacity of mesoscopic superconducting disks

F. R. Ong, Olivier Bourgeois

摘要:

通过对一系列独立铝圆片的热容测量,在H-T相图上研究了超导介观圆片的相变。这些磁盘表现出非周期性的调制与H的高度的热容量跳在超导正常过渡。这种行为归因于巨涡旋态,其特征在于它们的涡度L。一个交叉从散装到介观的行为证明。$C_{\rm p}$与H的关系图显示出当L增加或减少一个单位时的相变级联,具有很强的滞后。绘制了超导区内巨涡旋态在涡旋穿透和涡旋驱逐两种状态下的相图,预测了零场冷却状态下涡旋态之间温度驱动的相变,并得到了实验验证。

英文摘要:

Phase transitions in superconducting mesoscopic disks have been studied over the H-T phase diagram through heat capacity measurement of an array of independent aluminium disks. These disks exhibit non periodic modulations versus H of the height of the heat capacity jump at the superconducting to normal transition. This behaviour is attributed to giant vortex states characterized by their vorticity L. A crossover from a bulk-like to a mesoscopic behaviour is demonstrated. $C_{\rm p}$ versus H plots exhibit cascades of phase transitions as L increases or decreases by one unity, with a strong hysteresis. Phase diagrams of giant vortex states inside the superconducting region are drawn in the vortex penetration and expulsion regimes and phase transitions driven by temperature between vortex states are thus predicted in the zero field cooled regime before being experimentally evidenced.

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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