Field, temperature and strain dependence of the critical current for multi-filamentary MgB2 wire

Oh, Sangjun; Kim, Jung Ho; Lee, Chulhee; Choi, Heekyung; Kim, Chan-Joong; Dou, Shi Xue; Rindfleisch, M.; Tomsic, M.

doi:10.1016/j.physc.2008.05.093

Cited by 6 publications

(6 citation statements)

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“…4 We recently reported that even the strain dependence of the critical current can be understood by the percolation model as related to a variation in the anisotropy parameter. 5 A comprehensive study can be beneficial to elucidate the effects of doping on the superconductivity of MgB 2 . SiC doping has been limited by local agglomerations of unreacted SiC or decomposed carbon and in this work, the effect of carbohydrate doping via the chemical solution method has been studied.…”

Section: Introductionmentioning

confidence: 99%

“…It a) Electronic mail: wangpi@nfri.re.kr was shown that the field and temperature dependence of the critical current for bulk and wires, irradiated or not, can be described by only four parameters including two extrinsic fitting parameters, the pinning force maximum, F m , and the percolation threshold, p c [4]. We recently reported that even the strain dependence of the critical current can be understood by the percolation model as related to a variation in the anisotropy parameter [5].…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…5 Here, detailed critical current measurements have been carried out for a SiC doped multifilamentary wire. The doped wire was fabricated by the same way as for the undoped wire except carbon doping.…”

Section: Methodsmentioning

confidence: 99%

“…The pinning force maximum was lowered and seems to be a reason for the reduction in the critical current at low field by doping. 5 However, the effect of reduced effective cross-sectional area by porosity also needs to be considered. 6 The strain dependence of the critical current for an undoped MgB 2 wire was also studied and can be analyzed by the same percolation model.…”

Section: Introductionmentioning

confidence: 99%

“…6 The strain dependence of the critical current for an undoped MgB 2 wire was also studied and can be analyzed by the same percolation model. 5 It was argued that the linear strain dependence of the critical current for the undoped sample is mainly related to a variation in the anisotropy parameter. In this work, we study the effect of doping and applied strain a͒ Author to whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

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A comparative study on field, temperature, and strain dependences of the critical current for doped and undoped MgB2 wires based on the percolation model

Kim

Cho

et al. 2009

Journal of Applied Physics

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Articles you may be interested inEffect of excess Mg and nano-additives on the superconducting properties of weakly connected bulk MgB2 J. Appl. Phys. 113, 063908 (2013); 10.1063/1.4790802Effect of combined addition of nano-SiC and nano-Ho 2 O 3 on the in-field critical current density of MgB 2 superconductor Influence of the upper critical-field anisotropy on the transport properties of polycrystalline Mg B 2 Field, temperature, and strain dependences of the critical current for a SiC doped multifilamentary in situ MgB 2 wire have been studied. Measurement results were compared with that of the undoped wire, and the origin of the difference in the critical current is discussed. The critical current can be calculated with the percolation model considering the effect of anisotropy. The temperature dependence of the fitting parameters, the upper critical field along the ab-plane, and c-axis is compared with the dirty-limit two-gap theory. To assess the validity of the fitting parameters, resistive transition has been measured especially to extract the upper critical field directly. It is shown that even the resistive broadening can be well explained by a simple parallel path model using the fitting parameters obtained from the critical current analysis.

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MgB₂– An Intermediate‐Temperature Superconductor

Wesche¹

2015

Physical Properties of High‐Temperature Superconductors

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Field, temperature and strain dependence of the critical current for multi-filamentary MgB2 wire

Cited by 6 publications

References 18 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

A comparative study on field, temperature, and strain dependences of the critical current for doped and undoped MgB2 wires based on the percolation model

MgB₂– An Intermediate‐Temperature Superconductor

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Field, temperature and strain dependence of the critical current for multi-filamentary MgB2 wire

Cited by 6 publications

References 18 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

A comparative study on field, temperature, and strain dependences of the critical current for doped and undoped MgB2 wires based on the percolation model

MgB2– An Intermediate‐Temperature Superconductor

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Product

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MgB₂– An Intermediate‐Temperature Superconductor