Flux pinning property of artificially introduced Nb in Nb-Ti superconductors

Journal Article · Sun Jun 01 04:00:00 EDT 1997 · Advances in Cryogenic Engineering

OSTI ID:482124

Matsushita, T ^[1]; Iwakuma, M; Funaki, K ^[2]

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1. Kyushu Institute of Technology, Iizuka (Japan)
2. Kyushu Univ., Fukuoka (Japan); and others

The elementary pinning force of thin Nb layers introduced as artificial pinning centers in Nb-Ti is theoretically investigated in the relatively low field region using the Ginzburg-Landau theory. It is found that the pinning energy comes from the kinetic energy due to the induced superconductivity in the Nb layers by the proximity effect. Hence, these layers act as repulsive pinning centers, while normal layers such as {alpha}-Ti do as attractive ones. The elementary pinning force depends sensitively on the coherence length in the Nb layers and is larger for the longer coherence length. This value is predicted to be larger than that of {alpha}-Ti layers in commercial Nb-Ti wires even in the case of short coherence length.

• OSTI ID: 482124
• Report Number(s): CONF-950722--
• Journal Information: Advances in Cryogenic Engineering, Journal Name: Advances in Cryogenic Engineering Vol. 42B; ISSN ACYEAC; ISSN 0065-2482
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
MAGNETIC FLUX
NIOBIUM
NIOBIUM ALLOYS
SUPERCONDUCTORS
TITANIUM ALLOYS