Influence of microstructures and crystalline defects on the superconductivity of MgB2

Serquis, A.; Liao, Xiaozhou; Zhu, Yimei; Coulter, J.Y.; Huang, Jianyu; Willis, J. O.; Peterson, D. E.; Mueller, F. M.; Moreno, N. O.; Thompson, J. D.; Indrakanti, S. S.; Nesterenko, V. F.

doi:10.1063/1.1479470

Cited by 93 publications

(73 citation statements)

References 21 publications

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“…Other structural defects, such as vacancies, interstitials, substitutions, or stacking faults, 11 are other possible reasons for the observed lattice strain. It has been reported that there is a correlation between the resistivity and the lattice strain, 12 as can be seen in the inset of Fig. 3͑a͒.…”

Section: Resultsmentioning

confidence: 79%

Correlation between doping induced disorder and superconducting properties in carbohydrate doped MgB2

Kim

Dou

et al. 2008

Journal of Applied Physics

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A comprehensive study of the effects of carbohydrate doping on the superconductivity of MgB 2 has been conducted. In accordance with the dual reaction model, more carbon substitution is achieved at lower sintering temperature. As the sintering temperature is lowered, lattice disorder is increased. Disorder is an important factor determining the transition temperature for the samples studied in this work, as evidenced from the correlations among the lattice strain, the resistivity, and the transition temperature. It is further shown that the increased critical current density in the high field region can be understood by a recentlyproposed percolation model [M. Eisterer et al., Phys. Rev. Lett. 90, 247002 (2003)]. For the critical current density analysis, the upper critical field is estimated from a correlation that was reported in a recent review article [M. Eisterer, Supercond. Sci. Technol. 20, R47 (2007)], where a sharp increase in the upper critical field by doping is mainly due to an increase in lattice disorder or impurity scattering. On the other hand, it is shown that the observed reduction in self-field critical current density is related to the reduction in the pinning force density by carbohydrate doping. KeywordsCorrelation, between, doping, induced, disorder, superconducting, properties, carbohydrate, doped, MgB2 Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsKim, J, Dou, SX, Oh, S, Jercinovic, M, Babic, E, Nakane, T & Kumakura, H (2008), Correlation between doping induced disorder and superconducting properties in carbohydrate doped MgB2, Journal of Applied Physics, 104(6), 063911-1-063911-5. AuthorsJung Ho Kim, S X. Dou, Sangjun Oh, M Jercinovic, E Babic, T Nakane, and Hiroaki Kumakura A comprehensive study of the effects of carbohydrate doping on the superconductivity of MgB 2 has been conducted. In accordance with the dual reaction model, more carbon substitution is achieved at lower sintering temperature. As the sintering temperature is lowered, lattice disorder is increased. Disorder is an important factor determining the transition temperature for the samples studied in this work, as evidenced from the correlations among the lattice strain, the resistivity, and the transition temperature. It is further shown that the increased critical current density in the high field region can be understood by a recently-proposed percolation model ͓M. Eisterer et al., Phys. Rev. Lett. 90, 247002 ͑2003͔͒. For the critical current density analysis, the upper critical field is estimated from a correlation that was reported in a recent review article ͓M. Eisterer, Supercond. Sci. Technol. 20, R47 ͑2007͔͒, where a sharp increase in the upper critical field by doping is mainly due to an increase in lattice disorder or impurity scattering. On the other hand, it is shown that the observed reduction in self-field critical current density is related to the reduction in the pinning force density by carbohydrate doping.

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Section: Resultsmentioning

confidence: 79%

Correlation between doping induced disorder and superconducting properties in carbohydrate doped MgB2

Kim

Dou

et al. 2008

Journal of Applied Physics

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“…The microstructure of all doped samples exhibits small grains, while the undoped sample presents larger grains ͑ϳ1 m͒. 18 . Figure 4 illustrates the microstructure of ͑a͒ SiC and ͑b͒ swCNT samples with regions of grains from 20 to 100 nm.…”

Section: Resultsmentioning

confidence: 99%

“…Earlier attempts succeeded in raising the intragrain J c through the incorporation of Mg͑B 1−x O x ͒ 2 , 1 SiC, 2,12,13 Al, 3 Dy 2 O 3 , 4 nano-C, 5 and carbon nanotubes, 6,12,[14][15][16] which produce a decrease in the critical temperature ͑T c ͒ by chemical substitution and probably lattice strain. 17 The improvement of intergrain J c in bulk samples is related to grain connectivity 18 and may be achieved by optimizing the processing parameters ͑i.e., ultrasonication, 16 HIPing, 18 applying magnetic field during the sintering process, 19 etc.͒. The best results for H c2 ͑0͒ and J c at high field ͑H Ͼ 5 T͒ and 4 K in polycrystalline samples were achieved using C and SiC, respectively.…”

Section: Introductionmentioning

confidence: 99%

SiC and carbon nanotube distinctive effects on the superconducting properties of bulk MgB2

Serrano

Serquis

Dou

et al. 2008

Journal of Applied Physics

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This work describes in detail the simultaneous enhancement of the upper critical field ͑H c2 ͒ and the critical current density ͑J c ͒ of MgB 2 bulk samples doped with nano-SiC particles, as well as single-walled and double-walled ͑dw͒ carbon nanotubes ͑CNTs͒. The magnetization properties were examined in a superconducting quantum interference device magnetometer, and four-probe transport measurements were performed using a 50 T pulsed magnet to determine H c2 ͑T͒. We found that the J c enhancement is similar in all doped samples at 5 K but nano-SiC addition is more effective to improve the flux pinning in the high temperature range ͑T ജ 20 K͒; this improvement cannot solely be attributed to the C incorporation to the lattice but also to the presence of other types of defects ͑i.e., several kinds of nanoinclusions͒. CNTs produce a better C incorporation that is more effective to enhance H c2 ͓i.e., dwCNT-doped samples reached a record H c2 ͑0͒ϳ44 T value for bulk MgB 2 ͔. All the H c2 ͑T͒ curves obtained for different types of doping can be successfully described using a model for a two-gap superconductor in the dirty limit.

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“…Indeed, although considerable progress has already been made, it is still true that the best critical current densities J c reported so far on MgB 2 wires or tapes fabricated using the powder-in-tube (PIT) method are well below those of bulk samples prepared under high pressure. 2,3,4 To optimize J c in MgB 2 wires and tapes, we need a deeper understanding on how fabrication and processing conditions affect microstructure and vortex pinning. Some general facts have been established.…”

Section: Submitted To Aplmentioning

confidence: 99%

Microstructure and high critical current of powder-in-tube MgB2

Serquis

Civale

Hammon

et al. 2003

Applied Physics Letters

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We report dc transport and magnetization measurements of J c in MgB 2 wires fabricated by the powder-in-tube method, using commercial MgB 2 powder with 5 %at Mg powder added as an additional source of magnesium, and stainless steel as sheath material. By appropriate heat treatments, we have been able to increase J c by more than one order of magnitude from that of the as-drawn wire. We show that one beneficial effect of the annealing is the elimination of most of the micro-cracks, and we correlate the increase in J c with the disappearance of the weak-link-type behavior.

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Influence of microstructures and crystalline defects on the superconductivity of MgB2

Cited by 93 publications

References 21 publications

Correlation between doping induced disorder and superconducting properties in carbohydrate doped MgB2

Correlation between doping induced disorder and superconducting properties in carbohydrate doped MgB2

SiC and carbon nanotube distinctive effects on the superconducting properties of bulk MgB2

Microstructure and high critical current of powder-in-tube MgB2

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