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arXiv 1808.04090cond-mat.supr-concond-mat.mtrl-sci
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BiS2-based超导体REO0.5F 0.5BiS 2阻挡层高混合熵对超导性能的改善

Improvement of superconducting properties by high mixing entropy at blocking layers in BiS2-based superconductor REO0.5F0.5BiS2

Ryota Sogabe, Yosuke Goto, Tomohiro Abe, Chikako Moriyoshi, Yoshihiro Kuroiwa, Akira Miura, Kiyoharu Tadanaga, Yoshikazu Mizuguchi

摘要:

为了研究最近合成的高熵合金型(HEA型)REO 0.5F0.5BiS2超导体(RE:稀土)中的层间相互作用,我们系统地合成了具有接近的晶格参数和不同混合熵(DSMix)的样品。采用同步辐射X射线衍射和Rietveld精修研究了晶体结构。对于检查的样品与不同的DSMix,在DSMix的增加并没有很大程度上影响的键长和键角的BiS2导电层,但明显抑制在面内S1网站,这是在REO 0.5F0.5BiS2系统中出现体超导电性的参数必不可少的面内无序。对于本样品,通过增加DSMix来增强超导性的体性质。结果表明,阻挡层混合熵的增加对导电层体超导性的出现有积极的影响,这是阻挡层高熵态与导电层物理性质相互作用的证据。

英文摘要:

To investigate the interlayer interaction in the recently synthesized high-entropy-alloy-type (HEA-type) REO0.5F0.5BiS2 superconductors (RE: rare earth), we have systematically synthesized samples with close lattice parameters and different mixing entropy (DSmix) for the RE site. The crystal structure was investigated using synchrotron X-ray diffraction and Rietveld refinement. For the examined samples with different DSmix, the increase in DSmix does not largely affect the bond lengths and the bond angle of the BiS2 conducting layer but clearly suppresses the in-plane disorder at the in-plane S1 site, which is the parameter essential for the emergence of bulk superconductivity in the REO0.5F0.5BiS2 system. Bulk nature of superconductivity is enhanced by the increase in DSmix for the present samples. The results of this work clearly show that the increase in mixing entropy at the blocking layer can positively affect the emergence of bulk superconductivity in the conducting layer, which is the evidence of the interaction between the high entropy states of the blocking layers and the physical properties of the conducting layers.

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