Insulating and metallic spin glass in Ni-doped KxFe2-ySe2 single crystals

Title
Insulating and metallic spin glass in Ni-doped KxFe2-ySe2 single crystals
Authors
류혜진Milinda AbeykoonKefeng WangHechang LeiN. LazarevicJ. B. WarrenE. S. BozinZ. V. PopovicC. Petrovic
Issue Date
2015-05
Publisher
Physical review B, Condensed matter and materials physics
Citation
VOL 91-184503-6
Abstract
We report electron doping effects by Ni in KxFe2-delta-yNiySe2 (0.06 <= y <= 1.44) single-crystal alloys. A rich ground-state phase diagram is observed. A small amount of Ni (similar to 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.
URI
http://pubs.kist.re.kr/handle/201004/70383
ISSN
2469-9950
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KIST Publication > Article
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