2015/05/04 by Hyejin Ryu, Milinda Abeykoon, Kefeng Wang +10 · 9 citations
Chemistry · Materials Science · Physics and Astronomy · #Atomic physics #Chemistry #Condensed matter physics #Crystal structure #Crystallography #Electrical resistivity and conductivity #Ground state #Iron-based superconductors research #Lattice (music) #Magnetic and transport properties of perovskites and related materials #Materials science #Metal #Metallurgy #Phase (matter) #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Spin glass #Superconductivity #cond-mat.mtrl-sci #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.91.184503
published in Physical Review B 91(18) (American Physical Society) · 6 pages, 4 figures
openalex publication_date 2015/05/04 · arxiv created 2016/04/19 · arxiv updated 2016/04/20 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report electron doping effects by Ni in KxFe_2\ensuremath-\ensuremathδ\ensuremath-yNiySe2\phantom\rule4pt0ex(0.06\ensuremath≤y\ensuremath≤1.44) single-crystal alloys. A rich ground-state phase diagram is observed. A small amount of Ni (\ensuremath∼4%) suppressed superconductivity below 1.8 K, inducing insulating spin-glass magnetic ground state for higher Ni content. With further Ni substitution, metallic resistivity is restored. For high Ni concentration in the lattice the unit cell symmetry is high symmetry I4/mmm with no phase separation whereas both I4/m+I4/mmm space groups were detected in the phase separated crystals when concentration of Ni < Fe. The absence of superconductivity coincides with the absence of crystalline Fe vacancy order.