2018/08/31 by Ryota Sogabe, Yosuke Goto, Tomohiro Abe +5 · 62 citations
Chemistry · Materials Science · Physics and Astronomy · #Chemistry #Condensed matter physics #Crystal structure #Crystallography #Diffraction #Iron-based superconductors research #Lattice constant #Materials science #Optics #Physics #Physics of Superconductivity and Magnetism #Rare-earth and actinide compounds #Rietveld refinement #Superconductivity #Synchrotron #cond-mat.mtrl-sci #cond-mat.supr-con
paper · pdf · doi:10.1016/j.ssc.2019.04.001
published in Solid State Communications 295, 43-49 (Elsevier BV) · 13 pages, 6 figures, 1 table revised version for SSC
openalex created_date 2018/08/22 · arxiv created 2019/03/14 · openalex publication_date 2019/04/10 · arxiv updated 2019/05/06 · openalex updated_date 2026/08/05
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.