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

Abstract

We have synthesized high-entropy-alloy-type (HEA-type) RE123 superconductors Y0.28Nd0.16Sm0.18Eu0.18Gd0.20Ba2Cu3O7-d and Y0.18La0.24Nd0.14Sm0.14Eu0.15Gd0.15Ba2Cu3O7-d with a superconducting transition temperature (Tc) exceeding 90 K. From comparison between HEA-type and conventional RE123 samples, we found that the mixing entropy at the rare earth site does not affect Tc and critical current density (Jc) of the RE123 samples. For all the examined samples, orthorhombicity was found to be an essential parameter 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 structure with low orthorhombicity.

arXiv comment13 pages, 5 figures

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• Improvement of local critical current density of REBa2Cu3O7-d by the increase in configurational entropy of mixing at the RE site
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