Mechanism of enhanced critical fields and critical current densities of MgB2 wires with C/Dy2O3 co-additions

Wan, F.; Sumption, M. D.; Collings, E. W.

doi:10.1063/5.0130589

Title: Mechanism of enhanced critical fields and critical current densities of MgB₂ wires with C/Dy₂O₃ co-additions

Journal Article · Wed Jan 11 00:00:00 EST 2023 · Journal of Applied Physics

DOI:https://doi.org/10.1063/5.0130589· OSTI ID:1989914

^[1];

^[2]; Collings, E. W. ^[2]

The Ohio State Univ., Columbus, OH (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
The Ohio State Univ., Columbus, OH (United States)

A series of monofilamentary powder-in-tube MgB₂ wires were fabricated with 2 mol. % C doping and co-additions of 0-3 wt. % Dy₂O₃. Irreversibility fields (μ₀H_irr), upper critical fields (μ₀H_{c 2}), and transport critical currents were measured, and from these quantities, anisotropies (γ) and electronic diffusivities (D_π,σ) were estimated. The addition of 1 wt. % Dy₂O₃ to already optimally C-doped MgB₂ wires produced higher H_{c 2//ab}, H_{c 2//c}, and H_irr values at 4.2 K. In addition, the critical current density, J_c, increased with Dy₂O₃ concentration up to 1 wt. % where non-barrier J_c reached 4.35 × 10⁴ A/cm² at 4.2 K, 10 T. At higher temperatures, for example, 20 K and 5 T, co-additions of 2 mol. % C and 2 wt. % Dy₂O₃ improved non-barrier J_c by 40% and 93% compared to 2 and 3 mol. % C doping, respectively. On the other hand, measurements of T_c showed that C/Dy₂O₃ co-additions increase interband scattering rates at a lower rate than C doping does (assuming C doping levels giving similar levels of low-T μ₀H_{c 2} increase as co-addition). Comparisons to a two-band model for μ₀H_{c 2} in MgB₂ allowed us to conclude that the increases in H_{c 2//ab}, H_{c 2//c}, and H_irr (as well as concomitant increases in high-field J_c) with Dy₂O₃ addition are consistent with increases primarily in intraband scattering. In conclusion, this suggests C/Dy₂O₃ co-addition to be a more promising candidate for improving non-barrier J_c of MgB₂ at temperatures above 20 K.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); National Institutes of Health (NIH); National Science Foundation (NSF)

Grant/Contract Number:: AC02-07CH11359; R01EB018363; DMR-1,644,779

OSTI ID:: 1989914

Report Number(s):: FERMILAB-PUB-23-152-TD; oai:inspirehep.net:2650766

Journal Information:: Journal of Applied Physics, Vol. 133, Issue 2; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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