Universal relationship between crystallinity and irreversibility field of MgB2

Yamamoto, Akiyasu; Shimoyama, J.; Ueda, Shigenori; Katsura, Yukari; Iwayama, Isao; Horii, Shigeru; Kishio, K.

doi:10.1063/1.1937991

Cited by 138 publications

(105 citation statements)

References 24 publications

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“…This meaning that the shrinkage of a-axis length was happened due to carbon substitution for boron site, very similar to recent results [12]. The changes in lattice parameters indicated the lattice distortion of MgB 2 , which usually result in an enhancement of flux pinning [3,13]. No change was observed in peak positions of the (002) reflections, suggesting that C doping does not affect the c-axis.…”

Section: Methodssupporting

confidence: 74%

Effect of nano-C doping on thein-situprocessed MgB₂tapes

Zhang

et al. 2006

J. Phys.: Conf. Ser.

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Abstract. The effect of nano-C doping on the microstructure and superconducting properties of Fe-sheathed MgB 2 tapes prepared through the in-situ powder-in-tube method was studied. Heat treatment was performed at a low temperature of 650°C for 1 h. Scanning electron microscopy investigation revealed that the smaller grain size of MgB 2 in the samples with the C-doping. Further, the a-axis lattice parameter and transition temperature decreased monotonically with increasing doping level, which is due to the C substitution for B. High critical current density J C values in magnetic fields were achieved in the doped samples because of the very fine-grained microstructure of the superconducting phase obtained with C doping.

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Section: Methodssupporting

confidence: 74%

Effect of nano-C doping on thein-situprocessed MgB₂tapes

Zhang

et al. 2006

J. Phys.: Conf. Ser.

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“…3 Low sintering temperature is usually regarded as beneficial for flux pinning, due to the increase in the density of grain boundaries. 10 The bands are known to be strongly coupled with the optical E 2g phonon mode and the boron bond in-plane stretching mode, 1 and changes in the lattice parameters or the unit cell volume can influence the transition temperature as shown in Fig. 2͑b͒.…”

Section: Resultsmentioning

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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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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“…33,34 SiC provides moderate amounts of carbon substitution, largely independent of sintering temperature. 15 Low processing temperature results in small grain size, increasing grain boundary scattering, and consequently H c2 and J c .…”

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confidence: 99%

“…15 Low processing temperature results in small grain size, increasing grain boundary scattering, and consequently H c2 and J c . 34 For this reason, high-temperature sintering is counterproductive for both pure and SiC doped MgB 2 because this only increases the grain size, whereas carbon can be substituted into MgB 2 for nano-SiC doped samples at low temperatures ͑650°C͒. 1 Even though carbon doped samples have a large grain size for high sintering temperature ͑Fig.…”

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Effect of processing temperature on high field critical current density and upper critical field of nanocarbon doped MgB2

Yeoh

Horvat

Kim

et al. 2007

Applied Physics Letters

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Universal relationship between crystallinity and irreversibility field of MgB2

Abstract: Influence of the upper critical-field anisotropy on the transport properties of polycrystalline Mg B 2

Cited by 138 publications

References 24 publications

Effect of nano-C doping on thein-situprocessed MgB₂tapes

Effect of nano-C doping on thein-situprocessed MgB₂tapes

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

Effect of processing temperature on high field critical current density and upper critical field of nanocarbon doped MgB2

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Universal relationship between crystallinity and irreversibility field of MgB2

Abstract: Influence of the upper critical-field anisotropy on the transport properties of polycrystalline Mg B 2

Cited by 138 publications

References 24 publications

Effect of nano-C doping on thein-situprocessed MgB2tapes

Effect of nano-C doping on thein-situprocessed MgB2tapes

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

Effect of processing temperature on high field critical current density and upper critical field of nanocarbon doped MgB2

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Product

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Effect of nano-C doping on thein-situprocessed MgB₂tapes

Effect of nano-C doping on thein-situprocessed MgB₂tapes