Role of Sn impurity on electronic topological transitions in 122 Fe-based superconductors
arXiv:1603.08772 · doi:10.1016/j.jallcom.2016.03.257
Abstract
We show that only a few percentage of Sn doping at the Ba site on BaFeAs, can cause electronic topological transition, namely, the Lifshitz transition. A hole like d band of Fe undergoes electron like transition due to 4\% Sn doping. Lifshitz transition is found in BaFeAs system around all the high symmetry points. Our detailed first principles simulation predicts absence of any Lifshitz transition in other 122 family compounds like SrFeAs, CaFeAs. This work bears practical significance due to the facts that a few percentage of Sn impurity is in-built in tin-flux grown single crystals method of synthesizing 122 materials and inter-relationship among the Lifshitz transition, magnetism and superconductivity.
arXiv comment22 pages, 9 figures, Accepted by Journal of Alloys and Compounds (2016)
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