Signatures of Unconventional Superconductivity in Granular Aluminum

被引：16

作者：

Bachar, N. ^{[1
,3
]}

Pracht, U. S. ^{[2
]}

Farber, E. ^{[1
]}

Dressel, M. ^{[2
]}

Deutscher, G. ^{[3
]}

Scheffler, M. ^{[2
]}

机构：

[1] Ariel Univ, Lab Superconduct & Opt Spect, IL-40700 Ariel, Israel

[2] Univ Stuttgart, Inst Phys, D-70550 Stuttgart, Germany

[3] Tel Aviv Univ, Raymond & Beverly Sackler Sch Phys & Astron, IL-69978 Tel Aviv, Israel

来源：

JOURNAL OF LOW TEMPERATURE PHYSICS | 2015年 / 179卷 / 1-2期

关键词：

Unconventional superconductivity; Granular aluminum; THz spectroscopy; FILMS; ENHANCEMENT;

D O I：

10.1007/s10909-014-1244-z

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We present measurements of the complex transmission of superconducting granular aluminum thin films in the THz optical range. We discuss the dynamical conductivity and temperature-dependent energy gap of two films of different granular coupling. While the film of well-coupled grains follows the predictions for a conventional BCS superconductor, signatures of enhanced absorption are found at sub-gap frequencies when coupling is decreased. We discuss possible explanations which might account for the observed deviations from BCS theory.

引用

页码：83 / 89

页数：7

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