Role of Sn impurity on electronic topological transitions in 122 Fe-based superconductors

JOURNAL OF ALLOYS AND COMPOUNDS

卷:677

Article

Ghosh, Haranath^1,2  Sen, Smritijit^1,2 

[1] Homi Bhabha Natl Inst, Mumbai 400094, Maharashtra, India

[2] Raja Ramanna Ctr Adv Technol, Ind Synchrotrons Utilizat Div, Indore 452013, Madhya Pradesh, India

关键词: Fe-based superconductors;    Lifshitz transition;    Fermi surface;   

DOI  :  10.1016/j.jallcom.2016.03.257

来源: Elsevier

【 摘 要 】

We show that only a few percentage of Sn doping at the Ba site on BaFe2As2, can cause electronic topological transition, namely, the Lifshitz transition. A hole like dxy band of Fe undergoes electron like transition due to 4% Sn doping. Lifshitz transition is found in BaFe2As2 system around all the high symmetry points. Our detailed first principles simulation predicts absence of any Lifshitz transition in other 122 family compounds like SrFe2As2, CaFe2As2 in agreement with experimental observations. 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. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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