Flux pinning centers in superconducting Nb3Sn

Scanlan, R.M.; Fietz, W. A.; Koch, E. F.

doi:10.1063/1.321816

Cited by 261 publications

(88 citation statements)

References 7 publications

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“…7, while it brings high Tc. Since Nb3Sn grains are more coarsened with increasing heat treatment temperature, the high density of the pinning site is also an important factor to raise Jc especially in middle and lower magnetic field regions in the same way as in the case of Tc (22). The change in elemental pinning force by the addition of Ti is also regarded as an important factor.…”

Section: Superconducting Characteristicsmentioning

confidence: 99%

Effects of Titanium Addition to the Niobium Core on the Composite-Processed Nb<SUB>3</SUB>Sn

et al. 1986

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Effects of titanium addition to the niobium core on the composite-processed Nb3Sn superconductor have been investigated. Composites consisting of a Nb-0.0.5,1,2,3,4 at%Ti alloy core and a Cu-7 at% Sn alloy matrix were fabricated into single-core and 16-core multifilamentary wires, and then heattreated to form Nb3Sn layers. An enhanced formation rate of Nb3Sn layer with increasing titanium content has been observed, while the Nb3Sn grain size slightly increases with the titanium addition. The titanium addition of 1-2 at% to the niobium core produces a small increase in Tc, and further titanium addition decreases it. The addition of titanium to the core increases Hc2 by 4T in accordance with the increase in the normal state resistivity. Hc2 of about 25T has been obtained at 4.2K by the titanium addition. Jc's of Nb3Sn at high fields (H>13T) are remarkably increased by the titanium addition, which is been obtained at 4.2K and 16T for a single core wire and a 160-core multifilamentary wire, respectively. The Nb-Ti/Cu-Sn composite wire seems to be quite promising for applications in high magnetic fields ranging from 12 to 16 T.

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Section: Superconducting Characteristicsmentioning

confidence: 99%

Effects of Titanium Addition to the Niobium Core on the Composite-Processed Nb<SUB>3</SUB>Sn

et al. 1986

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“…In addition, to retain sufficient current carrying capacity towards higher magnetic fields, the grain size should preferably be comparable to the vortex spacing at operational [28]. The PIT results which only reflect the fine grains are from Fischer [20], and the B ronze results are from Scanlan et at, [33], Shaw [34], and Wu et at. [35].…”

Section: Exemplary Cross-section Morphology and Compositionmentioning

confidence: 99%

State of the art powder-in-tube niobium–tin superconductors

et al. 2008

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Powder-in-Tube (PIT) processed Niobium-Tin wires are commercially manufactured for nearly three decades and have demonstrated a combination of very high current density (presently up to 2500 Amm -2 non-Cu at 12 T and 4.2 K) with fine (35 /im), well separated filaments. We review the developments that have led to the present state of the art PIT Niobium-Tin wires, discuss the wire manufacturing and A15 formation processes, and describe typical superconducting performance in relation to magnetic field and strain. We further highlight successful applications of PIT wires and conclude with an outlook on possibilities for further improvements in the performance of PIT Niobium-Tin wires.

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“…The self-field J c is of the order of 10 7 A cm -2 at 5 K. On comparing with single-crystal like MgB 2 thin film, the J c of MgB 2 film with columnar grain-boundary is much higher than that of the single-crystal like film. It indicates that grain boundaries in MgB 2 do not obstruct current flow as in the high-temperature cuprate superconductors [56], but act as effective flux pinning centers like those in intermetallic superconductors, such as Nb 3 Sn [57].…”

Section: Mgb 2 Columnar Thick Filmsmentioning

confidence: 99%

“…11(b). The F p 's were expressed as a function of reduced fields (b=B/B*), where B* is the critical field estimated from a Kramer plot of J c 1/2 B 1/4 ∝ (B*-B) (not shown here) [57]. We achieved a very high maximum flux Fig.…”

Section: Mgb 2 Columnar Thick Filmsmentioning

confidence: 99%

A review on the understanding and fabrication advancement of MgB₂thin and thick films by HPCVD

Ranot¹,

Duong²,

Bhardwaj³

et al. 2015

Progress in Superconductivity and Cryogenics

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MgB 2 thin films with superior superconducting properties are very promising for superconducting magnets, electronic devices and coated conductor electric power applications. A clear understanding of flux pinning mechanism in MgB 2 films could be a big aid in improving the performance of MgB 2 by the enhancement of J c . The fabrication advancement and the understanding of flux pinning mechanism of MgB 2 thin and thick films fabricated by using hybrid physical-chemical vapor deposition (HPCVD) are reviewed. The distinct kind of MgB 2 films, such as single-crystal like MgB 2 thin films, MgB 2 epitaxial columnar thick films, and a-axis-oriented MgB 2 films are included for flux pinning mechanism investigation. Various attempts made by researchers to improve further the flux pinning property and J c performance by means of doping in MgB 2 thin films by using HPCVD are also summarized.Keywords: MgB2 thin and thick films, HPCVD, flux pinning mechanism * Corresponding author: email: wnkang@skku.edu A review on the understanding and fabrication advancement of MgB2 thin and thick films by HPCVD CCs showed self-field J c values of the order of 10 7 A/cm 2 at 5 K as high as already obtained in MgB 2 thin films, however, J c decreases in response to an applied magnetic field [31,32]. Therefore, a complete understanding of the flux pinning mechanism could be a big aid in improving the performance of MgB 2 by the enhancement of J c , which is most important parameter in practical applications for an operation with low noise and lower power loss. The epitaxial MgB 2 thin films with uniform orientation of grains provide an ideal condition for investigating the vortex dynamics and flux pinning properties, in contrast to MgB 2 bulk system where grains are randomly orientated. In this article, we review the progress made in the last 14 years for the fabrication, understanding of flux pinning mechanism, and for improving the performance by doping in MgB 2 epitaxial thin and thick films by using HPCVD technique.

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Flux pinning centers in superconducting Nb3Sn

Cited by 261 publications

References 7 publications

Effects of Titanium Addition to the Niobium Core on the Composite-Processed Nb<SUB>3</SUB>Sn

Effects of Titanium Addition to the Niobium Core on the Composite-Processed Nb<SUB>3</SUB>Sn

State of the art powder-in-tube niobium–tin superconductors

A review on the understanding and fabrication advancement of MgB₂thin and thick films by HPCVD

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Flux pinning centers in superconducting Nb3Sn

Cited by 261 publications

References 7 publications

Effects of Titanium Addition to the Niobium Core on the Composite-Processed Nb<SUB>3</SUB>Sn

Effects of Titanium Addition to the Niobium Core on the Composite-Processed Nb<SUB>3</SUB>Sn

State of the art powder-in-tube niobium–tin superconductors

A review on the understanding and fabrication advancement of MgB2thin and thick films by HPCVD

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A review on the understanding and fabrication advancement of MgB₂thin and thick films by HPCVD