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

材料科学技术（英文版） 2024年第22期189卷 60-67页

作者： Jihyun Kim Soon-Gil Jung Yoonseok Han Jin Hee Kim Jong-Soo Rhyee Sunmog Yeo tuson park Department of Physics Sungkyunkwan UniversitySuwon 16419Republic of Korea Department of Physics Education Sunchon National UniversitySuncheon 57922Republic of Korea Department of Applied Physics and Institute of Natural Sciences Integrated Education Institute for Frontier Science and Technology(BK 21 Four)Kyung Hee UniversityYongin17104Republic of Korea Korea Multi-purpose Accelerator Complex Korea Atomic Energy Research InstituteGyeongjuGyeongbuk38180Republic of Korea Department of Physics Sungkyunkwan UniversitySuwon 16419Republic of Korea Center for Quantum Materials and Superconductivity(CQMS) Sungkyunkwan UniversitySuwon 16419Republic of Korea

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 *** 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 ***,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.

关键词： High-entropy alloy superconductor Ta-Nb-Hf-Zr-Ti Annealing Critical current density Hardness

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Effects of irradiation on superconducting properties of small-grained MgB_(2) thin films

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Chinese Physics B 2023年第12期32卷 534-540页

作者：刘丽 Jung Min Lee Yoonseok Han Jaegu Song Chorong Kim Jaekwon Suk Won Nam Kang 刘杰 Soon-Gil Jung tuson park Center for Quantum Materials and Superconductivity(CQMS) Sungkyunkwan UniversitySuwon 16419Republic of Korea Department of Physics Sungkyunkwan UniversitySuwon 16419Republic of Korea Institute of Modern Physics Chinese Academy of Sciences(CAS)Lanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of Sciences(UCAS)Beijing 100049China Korea Multi-purpose Accelerator Complex Korea Atomic Energy Research InstituteGyeongjuGyeongbuk 38180Republic of Korea Department of Physics Education Sunchon National UniversitySuncheon 57922Republic of Korea

We investigate the effect of ion irradiation on MgB_(2) thin films with small grains of approximately 122 nm and 140 *** flux pinning by grain boundaries is insignificant in the pristine MgB_(2) films due to good inter-grain connectivity,but is significantly improved after 120-keV Mn-ion *** scaling behavior of the flux pinning force density for the ion-irradiated MgB_(2) thin films with nanoscale grains demonstrates the predominance of pinning by grain boundaries,in contrast to the single-crystalline MgB_(2) films where normal point pinning was dominant after low-energy ion *** results suggest that irradiation-induced defects can accumulate near the grain boundaries in metallic MgB_(2) superconductors.

关键词： MgB_(2)films grain boundaries flux pinning low-energy ion irradiation

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