Flux pinning in ternary (Nd0.33Eu0.33Gd0.33)Ba2Cu3Oy melt-processed superconductors

Koblischka, Michael Rudolf; Muralidhar, M.; Murakami, Masato

doi:10.1063/1.122458

Cited by 76 publications

(41 citation statements)

References 21 publications

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“…2(b). 41 In conclusion, we have performed a comparative study of the J c ðl 0 HÞ and the vortex pinning among pure and Mn doped K x Fe 2Ày Se 2 single crystals. The J c ðl 0 HÞ values can be greatly improved by Mn doping and post-quenching treatment when comparing to pristine pure sample.…”

Section: A)mentioning

confidence: 98%

Giant increase of critical current density and vortex pinning in Mn doped KxFe2−ySe2 single crystals

Chen

You

et al. 2014

Applied Physics Letters

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We report a comparative study of the critical current density (Jc) and vortex pinning among pure and Mn doped KxFe2−ySe2 single crystals. It is found that the Jc values can be greatly improved by Mn doping and post-quenching treatment when comparing to pristine pure sample. In contrast to pure samples, an anomalous second magnetization peak (SMP) effect is observed in both 1% and 2% Mn doped samples at T = 3 K for H∥ab but not for H∥c. Referring to Dew-Hughes and Kramer's model, we performed scaling analyses of the vortex pinning force density vs magnetic field in 1% Mn doped and quenched pristine crystals. The results show that the normal point defects are the dominant pinning sources, which probably originate from the variations of intercalated K atoms. We propose that the large nonsuperconducting K-Mn-Se inclusions may contribute to the partial normal surface pinning and give rise to the anomalous SMP effect for H∥ab in Mn doped crystals. These results may facilitate further understanding of the superconductivity and vortex pinning in intercalated iron-selenides superconductors.

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Section: A)mentioning

confidence: 98%

Giant increase of critical current density and vortex pinning in Mn doped KxFe2−ySe2 single crystals

Chen

You

et al. 2014

Applied Physics Letters

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“…This increased pinning can be explained as due to ␦T c ͑spatial variation of T c ) or ⌬ pinning ͑variation of the order parameter͒. 5 In this letter, we report the resistive transitions in magnetic fields, the voltage-current (V-I) characteristics and magnetization for several NEG samples with varying degrees of second-phase additions. We observe that the vortex viscosity increases remarkably with the addition of the second phase, promoting the vortex entanglement in the liquid phase.…”

mentioning

confidence: 98%

Evidence of strong flux pinning in melt-processed ternary (Nd–Eu–Gd)Ba2Cu3Oy superconductors

Pradhan

Muralidhar

Koblischka

et al. 1999

Applied Physics Letters

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The flux pinning behavior of ternary melt-processed (Nd–Eu–Gd)Ba2Cu3Oy superconductors is studied with varying defect concentrations using magnetotransport and magnetization measurements. A huge field-induced bump feature in the resistivity with increasing defect density, field-induced magnetization kink and linear voltage-current (V-I) characteristics over the whole transition temperature regime favor the phenomenon of vortex entanglement in the liquid phase. The Nd/Ba substitution sites along with the fine second-phase particles are one of the possible reasons for the vortex entanglement and these defects give rise to high critical current density and reduced dissipation at low temperature with significant enhancement in pinning.

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“…Recently, we ascribed the improvement of J c to the activity of the dT c -pinning [2], which is active mainly at elevated temperatures, i.e. around 77 K [3]. However, to facilitate bulk applications (e.g.…”

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confidence: 99%

Improvement of Critical Current Densities in Bulk Superconductors of the 123-Type

Muralidhar

Koblischka

Murakami

1999

phys. stat. sol. (a)

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Flux pinning in ternary (Nd0.33Eu0.33Gd0.33)Ba2Cu3Oy melt-processed superconductors

Cited by 76 publications

References 21 publications

Giant increase of critical current density and vortex pinning in Mn doped KxFe2−ySe2 single crystals

Giant increase of critical current density and vortex pinning in Mn doped KxFe2−ySe2 single crystals

Evidence of strong flux pinning in melt-processed ternary (Nd–Eu–Gd)Ba2Cu3Oy superconductors

Improvement of Critical Current Densities in Bulk Superconductors of the 123-Type

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