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 |
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Journal | IEEE Transactions on Applied Superconductivity |
DOIs | |
Publication status | Accepted/In press - 2018 Jan 1 |
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