High critical current density and high-tolerance superconductivity in high-entropy alloy thin films

Soon-Gil Jung (), Yoonseok Han, Jin Hee Kim, Rahmatul Hidayati, Jong-Soo Rhyee, Jung Min Lee, Won Nam Kang, Woo Seok Choi, Hye-Ran Jeon, Jaekwon Suk and Tuson Park ()
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Soon-Gil Jung: Sungkyunkwan University
Yoonseok Han: Sungkyunkwan University
Jin Hee Kim: Kyung Hee University
Rahmatul Hidayati: Kyung Hee University
Jong-Soo Rhyee: Kyung Hee University
Jung Min Lee: Sungkyunkwan University
Won Nam Kang: Sungkyunkwan University
Woo Seok Choi: Sungkyunkwan University
Hye-Ran Jeon: Korea Atomic Energy Research Institute
Jaekwon Suk: Korea Atomic Energy Research Institute
Tuson Park: Sungkyunkwan University

Nature Communications, 2022, vol. 13, issue 1, 1-7

Abstract: Abstract High-entropy alloy (HEA) superconductors—a new class of functional materials—can be utilized stably under extreme conditions, such as in space environments, owing to their high mechanical hardness and excellent irradiation tolerance. However, the feasibility of practical applications of HEA superconductors has not yet been demonstrated because the critical current density (Jc) for HEA superconductors has not yet been adequately characterized. Here, we report the fabrication of high-quality superconducting (SC) thin films of Ta–Nb–Hf–Zr–Ti HEAs via a pulsed laser deposition. The thin films exhibit a large Jc of >1 MA cm−2 at 4.2 K and are therefore favorable for SC devices as well as large-scale applications. In addition, they show extremely robust superconductivity to irradiation-induced disorder controlled by the dose of Kr-ion irradiation. The superconductivity of the HEA films is more than 1000 times more resistant to displacement damage than that of other promising superconductors with technological applications, such as MgB2, Nb3Sn, Fe-based superconductors, and high-Tc cuprate superconductors. These results demonstrate that HEA superconductors have considerable potential for use under extreme conditions, such as in aerospace applications, nuclear fusion reactors, and high-field SC magnets.

Date: 2022
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DOI: 10.1038/s41467-022-30912-5

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