arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1303.7396cond-mat.supr-con
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常规s波超导体中的相位涨落:维数和无序的作用

Phase fluctuations in a conventional s-wave superconductor: Role of dimensionality and disorder

Mintu Mondal

摘要:

作为我的博士论文的一部分,我研究了传统的s波超导体NbN的二维(2D)和三维(3D)超导薄膜中的相位起伏的影响,通过测量低频下的磁穿透深度和微波频率下的复电导率的电动力学响应。结果表明,在考虑小涡核能量的情况下,二维或准二维超导体的相变可以与标准的Berezinskiii-Kosterlitz-BKT(Berezinskiiii-Kosterlitz-BKT)相变相协调.在三维NbN薄膜中,我们发现,在存在强无序,超导性可以得到破坏的相位波动,即使库珀对继续生存在系统中。我们的研究提供了一个范例图片的重要性,在2D和强烈无序的3D超导体的相位波动。

英文摘要:

As a part of my doctoral thesis, I studied the effect of phase fluctuations in two dimensional (2D) and three dimensional (3D) superconducting films of conventional s-wave superconductor, NbN, by measuring the electrodynamics response through magnetic penetration depth at low frequency and the complex conductivity at microwave frequencies. We show that the phase transition in 2D or quasi-2D superconductors can be reconciled with the standard Berezinskii-Kosterlitz-Thouless (BKT) transition when the small vortex core energy is taken into consideration. In 3D NbN films, we show that in presence of strong disorder, superconductivity can get destroyed by phase fluctuations even if Cooper pairs continue to survive in the system. Our study provides a paradigmatic picture of importance of phase fluctuations in 2D and strongly disordered 3D superconductors.

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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