Adjustment of self-heating in long superconducting thin film NbN microbridges
Journal article, 2012

The self-heating in long superconducting microbridges made from thin NbN films deposited on top of high silicon mesa structures was studied by analyzing the hysteresis current density j(H). We observed a more than twofold decrease of j(H) with increase in the ratio of the height of the Si mesa, h, to the width of the microbridge, W, from 0 to 24. We describe our experimental results using one-dimensional thermal balance equations taking into account disordered matter in our thin NbN films and limitations imposed on the phonon mean free path by the width of the Si mesa. In the framework of this model we obtain a good agreement between theory and experiment over a wide temperature range from 4.2 K up to the critical temperature T-C for all h/W ratios.

silicon

waves

hot-electron bolometer

Author

A. Stockhausen

Karlsruhe Institute of Technology (KIT)

K. Il'in

Karlsruhe Institute of Technology (KIT)

M. Siegel

Karlsruhe Institute of Technology (KIT)

Ulf Södervall

Chalmers, Microtechnology and Nanoscience (MC2), Nanofabrication Laboratory

Piotr Jedrasik

Chalmers, Microtechnology and Nanoscience (MC2), Nanofabrication Laboratory

A. Semenov

German Aerospace Center (DLR)

Heinz-Wilhelm Hübers

German Aerospace Center (DLR)

Superconductor Science and Technology

0953-2048 (ISSN) 1361-6668 (eISSN)

Vol. 25 3

Subject Categories

Physical Sciences

DOI

10.1088/0953-2048/25/3/035012

More information

Latest update

5/29/2018