Aliovalent Substitution in 1144 Iron Based Superconductors: Effect on Structure and Superconducting Properties
IEEE Transactions on Applied Superconductivity(2022)
摘要
Ca/K-1144 compounds have been described widely in literature as stoichiometric compounds, with a Ca:K ratio equal to unity. In this work, we demonstrate that Sr ions can substitute K ions in the 1144 lattice. Polycrystalline samples were produced via a mechanochemically assisted synthesis route. Sr substitution in the Ca/K compound leads to a shortening of its c axis, while no differences are appreciable from the morphological point of view. The CaK0.9Sr0.1Fe4As4 compound is characterized by a slightly reduced critical temperature of approximately 31 K, with respect to the 35 K of the pristine compound. The role of lattice distortion carrier concentration or structural disorder that may be accounted for the reduction of critical temperature is here discussed.
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关键词
Compounds,Iron,Temperature measurement,Powders,Temperature,Lattices,Ions,Iron,pnictides,superconducting materials,superconducting materials growth
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