A multichannel superconducting tunnel junction detector for high-resolution X-ray spectroscopy of magnesium diboride films

被引：8

作者：

Friedrich, S ^{[1
]}

Vailionis, A

Drury, O

Niedermayr, T

Funk, T

Kang, WN

Choi, EM

Kim, HJ

Lee, SI

Cramer, SP

Kim, C

Labov, SE

机构：

[1] Lawrence Livermore Natl Lab, Adv Detector Grp, Livermore, CA 94550 USA

[2] Univ Calif Davis, Davis, CA 95616 USA

[3] Stanford Univ, Geballe Lab Adv Mat, Stanford, CA 94305 USA

[4] Univ Calif Berkeley, Lawrence Berkeley Lab, Phys Biosci Div, Berkeley, CA 94720 USA

[5] Pohang Univ Sci & Technol, Natl Creat Res Initiat Ctr Superconduct, Pohang 790784, South Korea

[6] Yonsei Univ, Dept Phys, Seoul 120749, South Korea

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 2003年 / 13卷 / 02期

关键词：

Josephson junctions; magnesium diboride; superconducting devices; X-ray spectrometers;

D O I：

10.1109/TASC.2003.814169

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We have built a high-resolution soft x-ray spectrometer using a 3 x 3 array of superconducting Nb-Al-AlOx-Al-Nb tunnel junctions. The detector is cooled to similar to0.1 K by a two-stage adiabatic demagnetization refrigerator while being held at the end of a 40-cm-long detector snout that can be inserted into an experimental chamber. The 0.6 mm x 0.6 mm array has an energy resolution of 10-15 eV FWHM for x-ray energies below I, keV and total count rate capabilities above 100 000 counts/s. We demonstrate the capabilities of the instrument in a study of anisotropy in c-axis oriented MgB2 films by near edge x-ray absorption spectroscopy. The absorption fine structure at the B K-edge differs for excitation with x-rays polarized along the c-axis and in the ab-plane of the MgB2 film. We discuss the implications of the anisotropy for the density of states in MgB2 at the Fermi surface.

引用

页码：1114 / 1119

页数：6

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