NDLI: Field response of ultra-thin type II superconducting transmission lines

Content Provider	IEEE Xplore Digital Library
Author	Troxler, R.E. Rodrigue, G.P. Peters, P.N.
Copyright Year	2002
Abstract	This work describes the effect of a tangential magnetic field on the superconducting penetration depth, /spl lambda/, as modeled by the theory of Ginzburg and Landau. In particular, an increasing magnetic field decreases the magnitude of the order parameter /spl Psi/. Consequently, the London equations have been modified to include field dependent values of the penetration depth, /spl lambda/(T,H) and complex conductivity, /spl sigma/(T,H). The analysis assumes that the superconducting films are free of vortices. For Type II films, this criteria can only be met when the thickness of the conductors is less than 1.8/spl xi//sub GL/. The G-L theory is used to find closed form solutions that describe the electromagnetic characteristics of a kinetic inductance transmission line including phase velocity, impedance, and energy loss, as functions of power, temperature and magnetic fields. Limitations of power are also discussed. To validate these concepts, experiments verifying the effects of temperature and bias field were implemented using niobium superconductors 500 /spl Aring/ thick separated by 1000 /spl Aring/ of Al/sub 2/O/sub 3/. Potential device applications include variable phase-shifters, tunable filters, and extremely sensitive bolometers.<>
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	65
Ending Page	75
Page Count	11
File Size	1177775
File Format	PDF
ISSN	10518223
Volume Number	4
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1994-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Type II superconductors Superconducting transmission lines Magnetic fields Superconducting films Conductive films Equations Conductivity Magnetic analysis Magnetic films Closed-form solution
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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