Enhancement of flux pinning and high-field critical current density in carbon-alloyed<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Mg</mml:mi><mml:msub><mml:mi mathvariant="normal">B</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>thin films

Chen, J.; Ferrando, V.; Orgiani, P.; Pogrebnyakov, Alexej; Wilke, Rudeger H. T.; Betts, J. B.; Mielke, C. H.; Redwing, Joan M.; Xi, X. X.; Li, Qi

doi:10.1103/physrevb.74.174511

Cited by 43 publications

(51 citation statements)

References 38 publications

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“…The F p,max gradually decreases with increasing temperature, and it obeys F p,max (1 -t) 1.77 , indicating the dominance of one kind of pinning source, the columnar grain boundary here, over a wide temperature region [59]. From a double logarithmic plot of F p,max -B*, we found that the F p,max scaled with B* according to the power law F p,max ∝B * ) 1.5 , and this result is similar to what was reported for polycrystals and carbon-doped MgB 2 films with values of J c (B) much higher than those of pure MgB 2 samples [60,61]. , at given B peak , respectively.…”

Section: Mgb 2 Columnar Thick Filmssupporting

confidence: 79%

“…Here, we used ξ(0) = 5 nm and λ(0) = 100 nm. irreversible field or the upper critical field in superconductors having strong pinning sources [61,64]. The values of K s are determined from the slopes of the F pb 0.5 (1 -b) 2 curves, and it scales as K s (1 -t) 1.7 , which agrees with the temperature dependence of F p,max shown in the inset of Fig.…”

Section: Mgb 2 Columnar Thick Filmssupporting

confidence: 73%

“…A TEM study proposed that the c-axis tilt in these carbon-alloyed MgB 2 thin films disturbs p z π orbits of MgB 2 , causing strong π band scattering, which may be the origin of the exceptional high H c2 (0 K) [90]. Carbon alloying has also been shown to enhance flux pinning; thus the high-field critical current density J c (H) and irreversibility field H irr in HPCVD films [61]. In MO-doped films it shown that the dominant pinning mechanism changes from grain boundary pinning to normal point pinning and back to grain boundary pinning when the carbon content increases [61].…”

Section: Effect Of Carbon-dopingmentioning

confidence: 99%

“…The current-carrying performance has been improved by carbon in all the form of MgB 2 superconductors, such as polycrystalline bulk, single crystals, wires, tapes, filaments, fibers and thin films. In contrast to MgB 2 bulks and single crystals, where the substitution of carbon for boron site seems easy, but is rather challenging to dope carbon in MgB 2 films, though only a little work has been reported [25,61]. In carbon-alloyed MgB 2 films made by HPCVD using a metal-organic (MeCp) 2 Mg (MO)as the carbon source, H c2 has been raised to above 60 T [25,89].…”

Section: Effect Of Carbon-dopingmentioning

confidence: 99%

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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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Section: Mgb 2 Columnar Thick Filmssupporting

confidence: 79%

Section: Mgb 2 Columnar Thick Filmssupporting

confidence: 73%

Section: Effect Of Carbon-dopingmentioning

confidence: 99%

Section: Effect Of Carbon-dopingmentioning

confidence: 99%

See 2 more Smart Citations

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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show abstract

“…More mixed-state parameters can be calculated from London theory and some Ginzburg-Landau relations. The magnetic penetration depth, l, was obtained from [10,34,35].…”

Section: Microstructuresmentioning

confidence: 99%

Flux pinning and vortex dynamics in MgB2 doped with TiO2 and SiC inclusions

Prokhorov

Kaminsky

Svetchnikov

et al. 2009

Low Temperature Physics

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The mixed-state superconducting properties of bulk MgB 2 + 2 at.% TiO 2 and + 8 at.% SiC, prepared by the in situ solid state reaction, have been investigated. The analysis on the mixed-state parameters, such as the upper critical field, the coherence length and the Ginzburg-Landau parameter, proves that the MgB 2 + + 2 at.% TiO 2 is a high-k type-II superconductor in the dirty limit while the MgB 2 + 8 at.% SiC corresponds to that in the moderately clean limit. It was shown that the anisotropic grain-boundary pinning is realized in the fine-grained doped MgB 2 polycrystals rather than the electron scattering one. The field-cooled temperature dependences of magnetic moment exhibit a transition of the samples to the paramagnetic state at certain applied magnetic fields, which is treated as manifestation of the paramagnetic Meissner effect. The experimental results are discussed on the base of modern theoretical approaches.

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Superconductivity in MgB ₂

Wilke

Bud’ko

Canfield

et al. 2010

High Temperature Superconductors

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Enhancement of flux pinning and high-field critical current density in carbon-alloyedMgB2thin films

Cited by 43 publications

References 38 publications

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

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

Flux pinning and vortex dynamics in MgB2 doped with TiO2 and SiC inclusions

Superconductivity in MgB ₂

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Enhancement of flux pinning and high-field critical current density in carbon-alloyedMgB2thin films

Cited by 43 publications

References 38 publications

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

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

Flux pinning and vortex dynamics in MgB2 doped with TiO2 and SiC inclusions

Superconductivity in MgB 2

Contact Info

Product

Resources

About

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

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

Superconductivity in MgB ₂