Universität zu Köln

Westig, M. P., Selig, S., Jacobs, K., Klapwijk, T. M. and Honingh, C. E. (2013). Improved Nb SIS devices for heterodyne mixers between 700GHz and 1.3 THz with NbTiN transmission lines using a normal metal energy relaxation layer. J. Appl. Phys., 114 (12). MELVILLE: AMER INST PHYSICS. ISSN 1089-7550

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Abstract

In this paper, we demonstrate experimentally the implementation of a niobium-trilayer junction with an aluminum-oxide tunnel barrier, embedded in a high-gap superconducting niobium-titanium-nitride circuit. Previously reported heating by quasiparticle trapping is removed by inserting a normal metal layer of gold between the niobium junction and the niobium-titanium-nitride layer. We analyze in dc-characterization measurements the cooling of the nonequilibrium quasiparticles in various device geometries having different gold layer thickness and shape. Our work is concluded with remarks for future heterodyne mixer experiments using our device technology. (C) 2013 AIP Publishing LLC.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Westig, M. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Selig, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Jacobs, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Klapwijk, T. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Honingh, C. E. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-475641
DOI:	10.1063/1.4822167
Journal or Publication Title:	J. Appl. Phys.
Volume:	114
Number:	12
Date:	2013
Publisher:	AMER INST PHYSICS
Place of Publication:	MELVILLE
ISSN:	1089-7550
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language INSULATOR-SUPERCONDUCTOR MIXERS; KAPITZA RESISTANCE; TUNING CIRCUIT; NOISE; INSTRUMENT; MILLIMETER; GREAT; FILMS Multiple languages Physics, Applied Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/47564