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Compositional Control of the Superconducting Properties of LiFeAs
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Department of Chemistry, University of Oxford.
, ‡Department of Physics, University of Oxford.
, §ISIS Facility.
Section:Abstract
The response of the superconducting state and crystal structure of LiFeAs to chemical substitutions on both the Li and the Fe sites has been probed using high-resolution X-ray and neutron diffraction measurements, magnetometry, and muon-spin rotation spectroscopy. The superconductivity is extremely sensitive to composition: Li-deficient materials (Li1−yFe1+yAs with Fe substituting for Li) show a very rapid suppression of the superconducting state, which is destroyed when y exceeds 0.02, echoing the behavior of the Fe1+ySe system. Substitution of Fe by small amounts of Co or Ni results in monotonic lowering of the superconducting transition temperature, Tc, and the superfluid stiffness, ρs, as the electron count increases. Tc is lowered monotonically at a rate of 10 K per 0.1 electrons added per formula unit irrespective of whether the dopant is Co and Ni, and at higher doping levels superconductivity is completely suppressed. These results and the demonstration that the superfluid stiffness in these LiFeAs-derived compounds is higher than in all of the iron pnictide materials underlines the unique position that LiFeAs occupies in this class.
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This article has been cited by 2 ACS Journal articles (2 most recent appear below).
Structure, Magnetism, and Superconductivity of the Layered Iron Arsenides Sr1-xNaxFe2As2
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Raquel Cortes-Gil and Simon J. ClarkeChemistry of Materials2011 23 (4), 1009-1016The synthesis and evolution of the structure, magnetic ordering, and superconductivity of the layered iron arsenides Sr1-xNaxFe2As2 is reported. In the Sr1-xNaxFe2As2 solid solution, the limiting Na-rich composition in samples made using conventional ...
Ru9Zn7Sb8: A Structure with a 2 × 2 × 2 Supercell of the Half-Heusler Phase
Ding-Bang Xiong, Yufeng Zhao, Norihiko L. Okamoto, Clemens Pietzonka, Takeshi Waki, and Haruyuki InuiInorganic Chemistry2010 49 (22), 10536-10542Ru9Zn7Sb8: A Structure with a 2 × 2 × 2 Supercell of the Half-Heusler Phase
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History
- Published In Issue August 04, 2010
- Article ASAPJuly 14, 2010
- Received: April 15, 2010
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