Flux pinning analysis of superconducting YBCO foam struts

Michael Rudolf Koblischka; Anjela Dimitrova Koblischka-Veneva; Crosby Soon Chang; Thomas Hauet; E. S. Reddy; Georg J. Schmitz

doi:10.1109/TASC.2018.2880334

Flux pinning analysis of superconducting YBCO foam struts

Michael Rudolf Koblischka, Anjela Dimitrova Koblischka-Veneva, Crosby Soon Chang, Thomas Hauet, E. S. Reddy, Georg J. Schmitz

SIT Research Laboratories

Research output: Contribution to journal › Article

4 Citations (Scopus)

Abstract

Magnetization loops were measured on struts of superconducting YBa2Cu3Ox (YBCO) foams taken from various positions of a 5 × 2 × 2 cm3 large foam sample prepared at RWTH Aachen. From these data, flux pinning forces, <formula><tex>$F_p = j_c$</tex></formula> × B, were calculated and pinning force scaling diagrams <formula><tex>$F_p/F_{p,max}$</tex></formula> vs. h = Ha/Hirr were established. The scaling in the temperature range 60 K < T < 90 K was found to be well developed for all samples with peak positions, h0, above 0.4, which is an indication of <formula><tex>$\delta T_c$</tex></formula>-pinning. From microstructure analysis using the electron backscatter diffraction technique (EBSD) it is known that the struts are fully converted into the 123-phase with embedded 211 particles being relatively small. The variation of <formula><tex>$F_p$</tex></formula> depending on the position of the struts in the original sample directly reveals the changes of the texture as found employing EBSD.

Original language	English
Journal	IEEE Transactions on Applied Superconductivity
DOIs	https://doi.org/10.1109/TASC.2018.2880334
Publication status	Accepted/In press - 2018 Jan 1

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Keywords

Flux pinning
flux pinning
foam
Force
irreversibil-ity fields
Magnetic field measurement
magnetization
Microstructure
scaling
Shape
Temperature measurement
YBCO
Yttrium barium copper oxide

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Cite this

Koblischka, M. R., Koblischka-Veneva, A. D., Chang, C. S., Hauet, T., Reddy, E. S., & Schmitz, G. J. (Accepted/In press). Flux pinning analysis of superconducting YBCO foam struts. IEEE Transactions on Applied Superconductivity. https://doi.org/10.1109/TASC.2018.2880334

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title = "Flux pinning analysis of superconducting YBCO foam struts",

abstract = "Magnetization loops were measured on struts of superconducting YBa2Cu3Ox (YBCO) foams taken from various positions of a 5 × 2 × 2 cm3 large foam sample prepared at RWTH Aachen. From these data, flux pinning forces, $F_p = j_c$ × B, were calculated and pinning force scaling diagrams $F_p/F_{p,max}$ vs. h = Ha/Hirr were established. The scaling in the temperature range 60 K < T < 90 K was found to be well developed for all samples with peak positions, h0, above 0.4, which is an indication of $\delta T_c$-pinning. From microstructure analysis using the electron backscatter diffraction technique (EBSD) it is known that the struts are fully converted into the 123-phase with embedded 211 particles being relatively small. The variation of $F_p$ depending on the position of the struts in the original sample directly reveals the changes of the texture as found employing EBSD.",

keywords = "Flux pinning, flux pinning, foam, Force, irreversibil-ity fields, Magnetic field measurement, magnetization, Microstructure, scaling, Shape, Temperature measurement, YBCO, Yttrium barium copper oxide",

author = "Koblischka, {Michael Rudolf} and Koblischka-Veneva, {Anjela Dimitrova} and Chang, {Crosby Soon} and Thomas Hauet and Reddy, {E. S.} and Schmitz, {Georg J.}",

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doi = "10.1109/TASC.2018.2880334",

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AU - Koblischka-Veneva, Anjela Dimitrova

AU - Chang, Crosby Soon

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AU - Reddy, E. S.

AU - Schmitz, Georg J.

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N2 - Magnetization loops were measured on struts of superconducting YBa2Cu3Ox (YBCO) foams taken from various positions of a 5 × 2 × 2 cm3 large foam sample prepared at RWTH Aachen. From these data, flux pinning forces, $F_p = j_c$ × B, were calculated and pinning force scaling diagrams $F_p/F_{p,max}$ vs. h = Ha/Hirr were established. The scaling in the temperature range 60 K < T < 90 K was found to be well developed for all samples with peak positions, h0, above 0.4, which is an indication of $\delta T_c$-pinning. From microstructure analysis using the electron backscatter diffraction technique (EBSD) it is known that the struts are fully converted into the 123-phase with embedded 211 particles being relatively small. The variation of $F_p$ depending on the position of the struts in the original sample directly reveals the changes of the texture as found employing EBSD.

AB - Magnetization loops were measured on struts of superconducting YBa2Cu3Ox (YBCO) foams taken from various positions of a 5 × 2 × 2 cm3 large foam sample prepared at RWTH Aachen. From these data, flux pinning forces, $F_p = j_c$ × B, were calculated and pinning force scaling diagrams $F_p/F_{p,max}$ vs. h = Ha/Hirr were established. The scaling in the temperature range 60 K < T < 90 K was found to be well developed for all samples with peak positions, h0, above 0.4, which is an indication of $\delta T_c$-pinning. From microstructure analysis using the electron backscatter diffraction technique (EBSD) it is known that the struts are fully converted into the 123-phase with embedded 211 particles being relatively small. The variation of $F_p$ depending on the position of the struts in the original sample directly reveals the changes of the texture as found employing EBSD.

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KW - scaling

KW - Shape

KW - Temperature measurement

KW - YBCO

KW - Yttrium barium copper oxide

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Access to Document

10.1109/TASC.2018.2880334