首页|Thermal-driven gigantic enhancement in critical current density of high-entropy alloy superconductors

Thermal-driven gigantic enhancement in critical current density of high-entropy alloy superconductors

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The high-entropy alloy(HEA)superconductor,Ta1/6Nb2/6Hf1/6Zr1/6Ti1/6(Ta-Nb-Hf-Zr-Ti),is systematically studied to examine changes in superconducting critical properties,critical temperature(Tc),critical cur-rent density(Jc),and upper critical field(Hc2),concerning thermal treatment conditions.Annealing condi-tion affects Jc more significantly than Tc and Hc2,with a large improvement of flux pinning force density(Fp).The Jc of bare sample is reduced to 10 A cm-2 at an applied magnetic field of approximately 1.5 T,whereas the sample annealed at 550 ℃ for 12 h exhibits Jc＞100 kA cm-2 up to around 4 T.Furthermore,the Vickers hardness(HVIT)of the Ta-Nb-Hf-Zr-Ti HEA superconductor notably increases from～384 to 528 HVIT following a 24-h annealing at 500 ℃.These results demonstrate that thermal annealing is a powerful process to optimize both the superconducting and mechanical properties of high-entropy alloy superconductors.

High-entropy alloy superconductorTa-Nb-Hf-Zr-TiAnnealingCritical current densityHardness

Jihyun Kim、Soon-Gil Jung、Yoonseok Han、Jin Hee Kim、Jong-Soo Rhyee、Sunmog Yeo、Tuson Park

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Department of Physics,Sungkyunkwan University,Suwon 16419,Republic of Korea

Department of Physics Education,Sunchon National University,Suncheon 57922,Republic of Korea

Department of Applied Physics and Institute of Natural Sciences,Integrated Education Institute for Frontier Science and Technology(BK 21 Four),Kyung Hee University,Yongin,17104,Republic of Korea

Korea Multi-purpose Accelerator Complex,Korea Atomic Energy Research Institute,Gyeongju,Gyeongbuk 38180,Republic of Korea

Center for Quantum Materials and Superconductivity(CQMS),Sungkyunkwan University,Suwon 16419,Republic of Korea

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accelerator group and operators of KOMAC(KAERI)National Research Foundation of Korea(NRF)grant funded by the Korean government(MIST)National Research Foundation of Korea(NRF)grant funded by the Korean government(MIST)National Research Foundation of Korea(NRF)grant funded by the Korean government(MIST)Basic Science Research Program through the NRF of Korea funded by the Ministry of EducationBasic Science Research Program through the NRF of Korea funded by the Ministry of Education

2021R1A2C2010925RS-2023-00240326RS-2023-00220471NRF-2019R1F1A1055284NRF-2021R111A1A01043885

2024

10.1016/j.jmst.2023.11.040

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.189(22)