Artificial pinning center Nb-Ti superconductors with alloyed Nb pins

A magnetic interaction has been proposed as the dominant fluxon-defect interaction in conventional and artificial pinning center (APC) Nb-Ti, emphasizing the proximity length (/spl xi//sub N/) of the pinning center as the important parameter for optimizing the high field critical current density. We...

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Veröffentlicht in:	IEEE transactions on applied superconductivity 1997-06, Vol.7 (2), p.1142-1145
Hauptverfasser:	Heussner, R.W., Nunes, C.B., Cooley, L.D., Larbalestier, D.C.
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Condensed matter: electronic structure, electrical, magnetic, and optical properties Critical current density Exact sciences and technology Flux pinning Magnetic fields Magnetic flux Metals. Metallurgy Niobium alloys Physics Pins Predictive models Properties of type I and type II superconductors Superconducting magnets Superconductivity Testing Vortex lattices ,flux pinning, flux creep
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Beschreibung
Zusammenfassung:	A magnetic interaction has been proposed as the dominant fluxon-defect interaction in conventional and artificial pinning center (APC) Nb-Ti, emphasizing the proximity length (/spl xi//sub N/) of the pinning center as the important parameter for optimizing the high field critical current density. We have characterized APC composites containing 25 vol.% of Nb pins alloyed with 7.5 wt.% Ta and 10 wt.% W to deliberately test the predictions of this model. We found that the bulk flux pinning force of the Nb10W-pin composite (/spl xi//sub N/(Nb10W)/spl sim/32 nm) exhibited a magnetic field (H) and pin size (d/sub p/) dependency that is more consistent with conventionally processed Nb47Ti (/spl xi//sub N/(/spl alpha/-Ti)
ISSN:	1051-8223 1558-2515
DOI:	10.1109/77.620693