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arXiv 2001.08365cond-mat.supr-concond-mat.mtrl-sci
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具有高熵合金型RE位的RE123高温超导体的合成

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

Yuta Shukunami, Aichi Yamashita, Yosuke Goto, Yoshikazu Mizuguchi

摘要:

我们合成了高熵合金型RE_(123)超导体Y_(0.28)Nd_(0.16)Sm_(0.18)Eu_(0.18)Gd_(0.20)Ba_2Cu_3 O_(7-d)和Y_(0.18)La_(0.24)Nd_(0.14)Sm_(0.14)Eu_(0.15)Gd_(0.15)Ba_2Cu_3 O_(7-d),超导转变温度(Tc)超过90 K。从HEA型和传统的RE 123样品之间的比较,我们发现,在稀土位的混合熵不影响Tc和临界电流密度(Jc)的RE 123样品。对于所有检查的样品,正交性被认为是一个重要的参数Tc和Jc。在正交-四面体边界附近区域,HEA型样品的Jc大于常规型样品的Jc,表明HEA型RE 123可能有助于提高低正交结构中的Jc。

英文摘要:

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.

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