On the use of hafnium based superconducting tunnel junctions as high resolution spectrometers for X-ray astronomy

被引：15

作者：

Kraft, S ^{[1
]}

Peacock, A ^{[1
]}

Bavdaz, M ^{[1
]}

Castelletto, B ^{[1
]}

Collaudin, B ^{[1
]}

Perez, D ^{[1
]}

Venn, R ^{[1
]}

Harper, T ^{[1
]}

机构：

[1] European Space Agcy, Dept Space Sci, Div Astrophys, NL-2200 AG Noordwijk, Netherlands

来源：

EUV, X-RAY, AND GAMMA-RAY INSTRUMENTATION FOR ASTRONOMY IX | 1998年 / 3445卷

关键词：

D O I：

10.1117/12.330280

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The nest generation of superconducting tunnel junctions based on lower critical temperature superconductors such as hafnium are now under development. Such a material with a bandgap well below a meV has the potential to provide very high wavelength resolution at soft X-ray wavelengths. In this paper we report the first results on the characteristics of hafnium thin films deposited on r-plane sapphire. The physical properties of these films together with the electrical and superconducting characteristics are described. Currently the electrical conductivity of these films are limited by scattering from the films columnar grain structure. The superconducting transition temperature has been found to vary from similar to 137 - 200 mK, somewhat higher than that in the bulk (similar to 128 mK), while the critical magnetic field applied in a direction parallel to the film is determined to be similar to 750 gauss far, larger than that observed in bulk hafnium.

引用

页码：226 / 235

页数：10