Shift of the flux-pinning force curve in Nb3Sn thinfilms with very fine grain size
Cooley, L.D.
Lee, P.J.
Appl. Supercond. Center, Wisconsin Univ., Madison, WI;
This paper appears in: Applied Superconductivity, IEEE Transactions on
Publication Date: Mar 2001
Volume: 11,
Issue: 1, Part 3
On page(s): 3820-3823
Meeting Date: 09/17/2000 - 09/22/2000
Location: Virginia Beach, VA, USA
ISSN: 1051-8223
References Cited: 17
CODEN: ITASE9
INSPEC Accession Number: 6956001
Digital Object Identifier: 10.1109/77.919897
Current Version Published: 2002-08-07
Abstract
Nb3Sn thin films were made by sputter deposition of Nb
onto bronze substrates at various temperatures. Deposition at 660°C
produced a Nb3Sn reaction immediately, which resulted in
films with 20-50 nm grains. The peak of Fp(H) for one of
these films was at 0.35 to 0.38 H*, higher than the field where the
standard flux-shear curve peaks, 0.2 H*. Deposition at 400°C
produced Nb films that were later reacted to form Nb3Sn films
with 50-250 nm grains. These films also exhibited Fp(H)
curves with peaks higher than 0.2 H*, but the shift was not as
pronounced as for the rapidly formed films. The shift of the pinning
force curve to higher fields is discussed in terms of the grain size
difference and a recent flux-pinning model. All of the films exhibited
an expanded Nb3Sn lattice parameter and degraded
superconducting properties, due to disorder and interstitial impurities
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