Variation of effective filament diameter, irreversibility field, anisotropy, and pinning efficiency in Bi-2212 round wires

Tarantini, Chiara; Barua, Shaon; Oloye, Temidayo Abiola; Kametani, Fumitake; Jiang, Jianyi; Hellstrom, Eric E.; Larbalestier, David C.

doi:10.1088/1361-6668/ad13b2

Variation of effective filament diameter, irreversibility field, anisotropy, and pinning efficiency in Bi-2212 round wires

Journal Article · Tue Dec 19 23:00:00 EST 2023 · Superconductor Science and Technology

DOI:https://doi.org/10.1088/1361-6668/ad13b2· OSTI ID:2246984

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Abstract

In recent years Bi ₂ Sr ₂ CaCu ₂ O _x (Bi-2212) received increasing attention due to its round wire multifilamentary architecture, a unique feature in high- T _c superconductor. In fact, round wires are preferable for magnet designs, including solenoids for nuclear magnetic resonance (NMR) or research purpose and accelerator magnets. However, due to the narrow over-pressure heat treatment conditions necessary to obtain high J _c and to the peculiar microstructure of Bi-2212 wires, a full understanding of the correlations between the different properties has not yet been developed. In this paper we investigate the effect of a vital part of Bi-2212 optimization, the maximum heat-treatment temperature T _max in the range of 885 °C–896 °C, on the variations of J _c , effective filament diameter d _eff , anisotropy γ , INTER- and intra-grain irreversibility fields and pinning energies U ₀ , all critical parameters in unravelling the complex mix of vortex pinning and connectivity that ultimately determines the critical current density. We found that d _eff of the higher J _c wires heat-treated at lower temperature is much smaller than for the lower J _c wires. Moreover, a systematic increase of the irreversibility field and a decrease of the intrinsic Bi-2212 anisotropy underpins the higher J _c . The analysis of the pinning energies reveals that there is little sample-to-sample variation in the INTER-grain pinning, whereas in all samples the intra-grain pinning has an enhancement below ∼40–45 K becoming more and more evident with increasing J _c . These results suggest that the overall J _c performance are not only related to the wire microstructure and connectivity, which obviously affect the INTER-grain properties, but they are also intimately related to the intrinsic and intra-grain properties such as γ and U ₀ .

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Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0010421

OSTI ID:: 2246984

Alternate ID(s):: OSTI ID: 2229182
OSTI ID: 2578747

Journal Information:: Superconductor Science and Technology, Journal Name: Superconductor Science and Technology Journal Issue: 1 Vol. 37; ISSN 0953-2048

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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