Effect of lattice strain and defects on the superconductivity of MgB2

Serquis, A.; Zhu, Yimei; Peterson, Eric J.; Coulter, J.Y.; Peterson, D. E.; Mueller, F. M.

doi:10.1063/1.1428109

Cited by 145 publications

(124 citation statements)

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“…For the SiC doping case, an opposite trend was observed: the transition temperature increased and the lattice parameter decreased with increasing sintering temperature. 3 On the other hand, a closer correlation can be found between the transition temperature and the lattice strain estimated from a Williamson-Hall plot using the isotropic model, 11 as can be seen in Fig. 2͑d͒ or in Fig.…”

Section: Resultsmentioning

confidence: 93%

“…At least under our empirical conditions, it can be argued that MgO precipitates are not the major cause of the lattice strain. 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.…”

Section: Resultsmentioning

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: Resultsmentioning

confidence: 93%

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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“…In Fig. 4 we plot the strain values vs. the RRR of our samples, 11 together with the data of Xue et al 9 . The clear dependence of RRR upon strain confirms that the residual resistance is related to lattice distortion (strain).…”

Section: Resultsmentioning

confidence: 99%

Influence of microstructures and crystalline defects on the superconductivity of MgB2

Serquis

Liao

Zhu

et al. 2002

Journal of Applied Physics

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This work studies the influence of microstructures and crystalline defects on the superconductivity of MgB 2 , with the objective to improve its flux pinning. A MgB 2 sample pellet that was hot isostatic pressed (HIPed) was found to have significantly increased critical current density (J c ) at high fields than its un-HIPed counterpart. The HIPed sample had a J c of 10000 A/cm 2 in 50000 Oe (5 T) at 5K. This was 20 times higher than that of the un-HIPed sample, and the same as the best J c reported by other research groups. Microstructures observed in scanning and transmission electron microscopy indicate that the HIP process eliminated porosity present in the MgB 2 pellet resulting in an improved intergrain connectivity. Such improvement in intergrain connectivity was believed to prevent the steep J c drop with magnetic field H that occurred in the un-HIPed MgB 2 pellet at H > 45000 Oe (4.5 T) and T = 5 K. The HIP process was also found to disperse the MgO that existed at the grain boundaries of the un-HIPed MgB 2 pellet and to generate more dislocations in the HIPed the pellets. These dispersed MgO particles and dislocations improved flux pinning also at H<45000 Oe. The HIPing process was also found to lower the resistivity at room temperature.74.70. Ad, 74.60.Ge, 74.62.Bf, 74.25.Fy 1

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“…These can be accomplished through: (i) site-substitution into the Mg sublattice by Zr [21,22], Na [23], or similar-sized cations [24][25][26][27], (ii) site-substitution into the B sublattice by C [28][29][30][31][32] (with regard to which we note that it has been difficult to distinguish t-he influence of substitution from effect of possible C-induced lattice strain [33][34]), and (iii) increasing the connectivity between MgB 2 grains (or grain clusters) to increase the efficiency of supercurrent flow [35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Drawing induced texture and the evolution of superconductive properties with heat treatment time in powder-in-tubein situprocessed MgB₂strands

Susner

Daniels

Sumption

et al. 2012

Supercond. Sci. Technol.

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Monocore powder-in-tube MgB 2 precursor strands were cold-drawn and heat- This effect is attributed to the fibrous macrostructure and its accompanying anisotropic connectivity. Magnetic measurements with the field directed along the strand axis yielded a critical density, J cm ┴ (B), for current flowing transversely to the strand axis that was less than and dropped off more rapidly than J ct (B). In the conventional magnetic measurement, the loop currents that support the magnetization are restricted by the lower of J ct (B) and J cm  (B). In the present case the latter, leading to the premature dropoff of the measured J cm (B) compared to J ct (B) with increasing field. This result is supported byKramer plots of the J cm  (B) and J ct (B) data which lead to an irreversibility field for transverse current that is very much less than the usual transport-measured longitudinal one, B irr,t .

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Effect of lattice strain and defects on the superconductivity of MgB2

Cited by 145 publications

References 12 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

Influence of microstructures and crystalline defects on the superconductivity of MgB2

Drawing induced texture and the evolution of superconductive properties with heat treatment time in powder-in-tubein situprocessed MgB₂strands

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Effect of lattice strain and defects on the superconductivity of MgB2

Cited by 145 publications

References 12 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

Influence of microstructures and crystalline defects on the superconductivity of MgB2

Drawing induced texture and the evolution of superconductive properties with heat treatment time in powder-in-tubein situprocessed MgB2strands

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Product

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Drawing induced texture and the evolution of superconductive properties with heat treatment time in powder-in-tubein situprocessed MgB₂strands