Modification of Layer Structures of Superconducting Tunnel Junctions to Improve X-ray Energy Resolution

被引：3

作者：

Ukibe, Masahiro ^{[1
]}

Fujii, Go ^{[1
]}

Shiki, Shigetomo ^{[1
]}

Kitajima, Yoshinori ^{[2
]}

Ohkubo, Masataka ^{[1
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki, Japan

[2] High Energy Accelerator Res Org, Tsukuba, Ibaraki, Japan

来源：

JOURNAL OF LOW TEMPERATURE PHYSICS | 2016年 / 184卷 / 1-2期

关键词：

Nb/Al STJ; High energy resolution; Thick Nb electrode; Quasiparticle recombination; XAFS;

D O I：

10.1007/s10909-016-1488-x

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The layer structure of a Nb/Al-based superconducting tunnel junction (STJ) X-ray detector was modified to improve the energy resolution () of STJ X-ray detectors by suppressing the recombination of excited quasiparticles in the electrodes. A 100-pixel array of 100 100 m STJs with a symmetric layer structure of Nb (300 nm)/Al-AlO(70 nm)/Al (70 nm)/Nb (300 nm) was fabricated. Fabrication yields of the 100 pixels were more than 90 %. The average leak current of the STJ array was 8 nA. The mean of the STJ array was 6.7 1.0 eV for 400 eV X-rays. This is the best value reported for Nb/Al STJs.

引用

页码：200 / 205

页数：6

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