NDLI: Invariant strain analysis of the critical temperature T/sub c/ of Nb/sub 3/Sn

Content Provider	IEEE Xplore Digital Library
Author	Markiewicz, W.D.
Copyright Year	2002
Abstract	An analysis has been made that incorporates the strain dependence of the critical temperature T/sub c/ of Nb/sub 3/Sn in a calculation using the formalism of strong superconductivity. The critical temperature in the absence of strain depends on the harmonic phonon spectrum. The value of T/sub c/ can be related to the acoustic phonon modes. It is found that the phonon frequency characteristics can be determined, in a simple model, from a scalar strain energy potential that is a function of the invariants of the strain tensor under the cubic symmetry group and that includes harmonic and anharmonic terms. The strain dependent anharmonic phonon spectrum is found to result in the strain dependence of T/sub c/. A calculation of the normalized strain dependence T/sub c/(/spl epsiv/)/T/sub cm/ is presented for assumed wire and tape composite conductors and shown to agree with measurements from the literature over the full range of strain. The correspondence of the various strain scalar invariants with various aspects of the typical strain profile is discussed. The analysis contains the influence of the hydrostatic strain on T/sub c/ and relates the observed asymmetry in the strain profile between compressive and tensile intrinsic strain to the principle part of the third strain invariant.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	3368
Ending Page	3371
Page Count	4
File Size	150228
File Format	PDF
ISSN	10518223
Volume Number	15
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Capacitive sensors Phonons Tensile strain Strain measurement Temperature dependence Niobium Tin Superconductivity Frequency Potential energy superconductor Critical temperature strain dependence
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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