# 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

Research output: Contribution to journalArticle

3 Citations (Scopus)

### Abstract

Magnetization loops were measured on struts of superconducting YBa2Cu3Ox (YBCO) foams taken from various positions of a 5 &#x00D7; 2 &#x00D7; 2 cm3 large foam sample prepared at RWTH Aachen. From these data, flux pinning forces, <formula><tex>$F_p = j_c$</tex></formula> &#x00D7; 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 &lt; T &lt; 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 IEEE Transactions on Applied Superconductivity https://doi.org/10.1109/TASC.2018.2880334 Accepted/In press - 2018 Jan 1

### Fingerprint

Flux pinning
struts
Struts
flux pinning
foams
Foams
Electron diffraction
scaling
diffraction
Magnetization
indication
electrons
textures
Textures
diagrams
magnetization
microstructure
Microstructure
Temperature
temperature

### 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

Flux pinning analysis of superconducting YBCO foam struts. / Koblischka, Michael Rudolf; Koblischka-Veneva, Anjela Dimitrova; Chang, Crosby Soon; Hauet, Thomas; Reddy, E. S.; Schmitz, Georg J.

In: IEEE Transactions on Applied Superconductivity, 01.01.2018.

Research output: Contribution to journalArticle

@article{3e167741784a43999aa57409d328cf12,
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.}",
year = "2018",
month = "1",
day = "1",
doi = "10.1109/TASC.2018.2880334",
language = "English",
journal = "IEEE Transactions on Applied Superconductivity",
issn = "1051-8223",
publisher = "Institute of Electrical and Electronics Engineers Inc.",

}

TY - JOUR

T1 - Flux pinning analysis of superconducting YBCO foam struts

AU - Koblischka, Michael Rudolf

AU - Koblischka-Veneva, Anjela Dimitrova

AU - Chang, Crosby Soon

AU - Hauet, Thomas

AU - Reddy, E. S.

AU - Schmitz, Georg J.

PY - 2018/1/1

Y1 - 2018/1/1

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.

KW - Flux pinning

KW - flux pinning

KW - foam

KW - Force

KW - irreversibil-ity fields

KW - Magnetic field measurement

KW - magnetization

KW - Microstructure

KW - scaling

KW - Shape

KW - Temperature measurement

KW - YBCO

KW - Yttrium barium copper oxide

UR - http://www.scopus.com/inward/record.url?scp=85056339535&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85056339535&partnerID=8YFLogxK

U2 - 10.1109/TASC.2018.2880334

DO - 10.1109/TASC.2018.2880334

M3 - Article

AN - SCOPUS:85056339535

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

SN - 1051-8223

ER -