Critical de Broglie wavelength in superconductors
Critical de Broglie wavelength in superconductors
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DOI：
10.1142/s0217984918501142
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发表时间：
2018-03-30
影响因子：
1.9
通讯作者：
Talantsev, E. F.
中科院分区：
文献类型：
--
作者：
Talantsev, E. F.
越来越多的实验证据表明，自场临界电流J（c）（sf，T）是研究从原子薄膜到超导体基本性质的一种新的指导性工具[M. Liao等人，Nat. Phys. 6（2018），https：//doi.org/10.1038/s41567-017-0031-6; E. F.塔兰采夫等人，2D Mater。4（2017）025072; A. Fete等人，应用物理信函109（2016）192601]至毫米级样品[E. F. Talantsev等人，Sci. 7（2017）10010]。Talantsev和Tallon [Nat. Commun. 6（2015）7820]，并且它是相关的临界场（即，对于I型超导体的热力学场B-c和对于II型超导体的较低临界场B-c1）除以伦敦穿透深度λ（L）。在本文中，我们报告了与此经验方程有关的新发现。超导载流子的布罗意波的临界波长λ（dB，c）在数值前置因子内等于金斯堡-朗道理论的两个特征长度中的最大值，即I型超导体的相干长度Xi或II型超导体的伦敦穿透深度λ（L）。我们还制定了一个微观标准的耗散输运电流的开始：p（s）。2.lambda（L）/ln（1+root 2.（lambda（L）/Xi））>= 1/2。（h/2 π），其中p（s）是电荷载流子动量，h是普朗克常数，不等式符号“
There are growing numbers of experimental evidences that the self-field critical currents, J(c)(sf,T), are a new instructive tool to investigate fundamental properties of superconductors ranging from atomically thin films [M. Liao et al., Nat. Phys. 6 (2018), https://doi.org/10.1038/s41567-017-0031-6; E. F. Talantsev et al., 2D Mater. 4 (2017) 025072; A. Fete et al., Appl. Phys. Lett. 109 (2016) 192601] to millimeter-scale samples [E. F. Talantsev et al., Sci. Rep. 7 (2017) 10010]. The basic empirical equation which quantitatively accurately described experimental J(c)(sf,T) was proposed by Talantsev and Tallon [Nat. Commun. 6 (2015) 7820] and it was the relevant critical field (i.e. thermodynamic field, B-c, for type-I and lower critical field, B-c1, for type-II superconductors) divided by the London penetration depth, lambda(L). In this paper, we report new findings relating to this empirical equation. It is that the critical wavelength of the de Broglie wave, lambda(dB,c) , of the superconducting charge carrier which within a numerical pre-factor is equal to the largest of two characteristic lengths of Ginzburg-Landau theory, i.e. the coherence length, xi , for type-I superconductors or the London penetration depth, lambda(L), for type-II superconductors. We also formulate a microscopic criterion for the onset of dissipative transport current flow: p(s) . 2.lambda(L)/ln(1+root 2.(lambda(L)/xi)) >= 1/2 . (h/2 pi), where p(s) is the charge carrier momentum, h is Planck's constant and the inequality sign "