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[2L10] Irradiation effects on high entropy cuprate superconductor thin films
Keywords:high entropy, superconducting magnet, irradiation defect
Copper oxide superconductor (REBCO) is a good candidate for magnets in fusion reactors. However, its superconductivity can be degraded by neutron irradiation. In order to reduce the degradation, we have applied the concept of high-entropy (HE) alloys to the RE sites of REBCO, since HE have been reported to be resistant to irradiation in recent years. In this study, single-crystal YBCO and REBCO (where the RE sites are substituted with several elements) deposited on a SrTiO3 substrate were irradiated with 1 MeV He ions at a fluence of 4.36x1015 ions/cm2. Our REBCO suppressed the decrease of Tc by 10 K compared to YBCO, while much larger decreases of Jc. The relationship between these changes and irradiation defects is discussed.
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