Enhancing the superconducting temperature of MgB2 by SWCNT dilution

Ma, Danhao; Jayasingha, Ruwantha; Hess, Dustin; Adu, Kofi W.; Суманасекера, Гамини; Terrones, Mauricio

doi:10.1016/j.physc.2013.09.017

Cited by 6 publications

(5 citation statements)

References 49 publications

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“…Adu et al . 8 increased the T C of commercial “dirty” MgB 2 by conducting non-substitutional hole-doping of the MgB 2 structure using minute, single-wall carbon nanotube inclusions. In accordance with homogeneous system theory 9 , Smolyaninov et al .…”

Section: Introductionmentioning

confidence: 99%

“…Drozdov et al [7] reported conventional superconductivity at 203 K under high pressure in a sulfur hydride system. Adu et al [8] increased the TC of commercial ''dirty'' MgB2 by conducting nonsubstitutional hole-doping of the MgB2 structure using minute, single-wall carbon nanotube inclusions. In accordance with homogeneous system theory [9], Smolyaninov et al [10][11][12] stated that a superconducting metamaterial with an effective dielectric response function that is less and approximately equal to zero may exhibit high TC, and they verified this theory in their subsequent experiments.…”

Section: Introductionmentioning

confidence: 99%

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Smart meta-superconductor MgB2 constructed by the dopant phase of luminescent nanocomposite

Chen

Wang

et al. 2019

Sci Rep

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On the basis of the idea that the injecting energy will improve the conditions for the formation of Cooper pairs, a smart meta-superconductor (SMSC) was prepared by doping luminescent nanocomposite Y2O3:Eu3+/Ag in MgB2. To improve the superconducting transition temperature (TC) of the MgB2-based superconductor, two types of Y2O3:Eu3+/Ag, which has the strong luminescence characteristic, with different sizes were prepared and marked as m-Y2O3:Eu3+/Ag and n-Y2O3:Eu3+/Ag. MgB2 SMSC was prepared through an ex situ process. Results show that when the dopant content was fixed at 2.0 wt.%, the TC of MgB2 SMSC increased initially then decreased with the increase in the Ag content in the dopant. When the Ag content is 5%, the TC of MgB2 SMSC was 37.2–38.0 K, which was similar to that of pure MgB2. Meanwhile, the TC of MgB2 SMSC doped with n-Y2O3:Eu3+/Ag increased initially then decreased basically with the increase in the content of n-Y2O3:Eu3+/Ag, in which the Ag content is fixed at 5%. The TC of MgB2 SMSC doped with 0.5 wt.% n-Y2O3:Eu3+/Ag was 37.6–38.4 K, which was 0.4 K higher than that of pure MgB2. It is thought that the doping luminescent nanocomposite into the superconductor is a new means to improve the TC of SMSC.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Smart meta-superconductor MgB2 constructed by the dopant phase of luminescent nanocomposite

Chen

Wang

et al. 2019

Sci Rep

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“…superconducting properties, especially the upper critical field (B c2 ), vortex pinning and intergranular connectivity, still need to be optimized to make MgB 2 suitable for power applications [3]. Various methods have been used to improve the J c -B properties, such as irradiation with heavy ions [4], processing in an external magnetic field [5], mechanical alloying [6][7][8][9] and chemical doping [10][11][12][13][14][15][16][17][18][19]. An unacceptable problem of the in situ PIT process is the low mass density, which is caused by the reduction of volume and the introduction of voids during the reaction process of Mg and B powders.…”

Section: Introductionmentioning

confidence: 99%

Influence of crystalline boron powders on superconducting properties of C-doped internal Mg diffusion processed MgB₂wires

Wang

Zhang

Tang

et al. 2015

Supercond. Sci. Technol.

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Monofilament MgB 2 /Fe wires or tapes were fabricated with two different purity crystalline boron powders, using internal magnesium diffusion (IMD) and in situ powder-in-tube (PIT) processes. To evaluate which method was more insensitive to the purity of the boron powders, a sensitivity factor was used. It was found that the IMD process was less sensitive to the purity of the boron powders, compared to the PIT method. Furthermore, J c values of the IMD-processed wires were higher than those of the PIT-processed samples. The reduced porosity and hence the increased density in the IMD-processed samples was thought to be the main reason. Although a number of B-rich particles remained in the MgB 2 region, a layer J c as high as 4.8×10 4 A cm −2 at 4.2 K and 10 T was still obtained in the IMD-processed wire, which was comparable to that of IMD-processed wires fabricated using amorphous boron powders.

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“…Another proposed method for improving the TC is by introducing more holes to increase the carrier concentration. In 2014, Adu et al presented for the first time an enhancement (from 33.0 K to 37.8 K) of the superconducting temperature of "dirty" MgB2 by doping the single-wall carbon nanotubes [34]. Improving the superconducting critical temperature of MgB2 is significant but challenging.…”

Section: Introductionmentioning

confidence: 99%

Critical Temperature of Smart Meta-superconducting MgB2

Tao

Chen

et al. 2017

J Supercond Nov Magn

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Enhancing the critical temperature (TC) is important not only to the practical applications but also to the theories of superconductivity. MgB2 is a type II superconductor with a TC of 39 K, which is very close to the McMillan limit. Improving the TC of MgB2 is challenging but significant. Inspired by the metamaterial structure, we designed a smart meta-superconductor that consists of MgB2 microparticles and Y2O3:Eu 3+ nanorods. In the local electric field, Y2O3:Eu 3+ nanorods will generate electroluminescence (EL) that can excite MgB2 particles, thereby improving the TC by strengthening the electron-phonon interaction. Each MgB2-based superconductor doped with one of the four dopants of different EL intensities was prepared by an exsitu process. The results showed that the addition of Y2O3:Eu 3+ brings about an impurity effect that decreases the TC and an EL exciting effect that increases the TC. Apart from the EL intensity, the micro-morphology and degree of dispersion of the dopants also affected the TC. This smart meta-superconductor provides a new method for increasing TC.

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Enhancing the superconducting temperature of MgB2 by SWCNT dilution

Cited by 6 publications

References 49 publications

Smart meta-superconductor MgB2 constructed by the dopant phase of luminescent nanocomposite

Smart meta-superconductor MgB2 constructed by the dopant phase of luminescent nanocomposite

Influence of crystalline boron powders on superconducting properties of C-doped internal Mg diffusion processed MgB₂wires

Critical Temperature of Smart Meta-superconducting MgB2

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Enhancing the superconducting temperature of MgB2 by SWCNT dilution

Cited by 6 publications

References 49 publications

Smart meta-superconductor MgB2 constructed by the dopant phase of luminescent nanocomposite

Smart meta-superconductor MgB2 constructed by the dopant phase of luminescent nanocomposite

Influence of crystalline boron powders on superconducting properties of C-doped internal Mg diffusion processed MgB2wires

Critical Temperature of Smart Meta-superconducting MgB2

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Influence of crystalline boron powders on superconducting properties of C-doped internal Mg diffusion processed MgB₂wires