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We have synthesized high-entropy-alloy-type (HEA-type) RE123 superconductorsY0.28Nd0.16Sm0.18Eu0.18Gd0.20Ba2Cu3O7-d andY0.18La0.24Nd0.14Sm0.14Eu0.15Gd0.15Ba2Cu3O7-d with a superconducting transitiontemperature (Tc) exceeding 90 K. From comparison between HEA-type andconventional RE123 samples, we found that the mixing entropy at the rare earthsite does not affect Tc and critical current density (Jc) of the RE123 samples.For all the examined samples, orthorhombicity was found to be an essentialparameter for Tc and Jc. In the regime near orthorhombic-tetragonal boundary,Jc for the HEA-type sample was larger than that of conventional-type samples,which suggests that HEA-type RE123 may be useful to improve Jc in the structurewith low orthorhombicity.

Synthesis of RE123 high-Tc superconductors with a high-entropy-alloy-type RE site