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Effect of Li-deficiency impurities on the electron-overdoped LiFeAs superconductor

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arxiv 1208.0909 v1 pith:QI6TSKAD submitted 2012-08-04 cond-mat.supr-con

Effect of Li-deficiency impurities on the electron-overdoped LiFeAs superconductor

classification cond-mat.supr-con
keywords electron-overdopedlifeaseffectli1-xfeasnonsuperconductingpropertiesscatteringsimilar
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We use transport, inelastic neutron scattering, and angle resolved photoemission experiments to demonstrate that the stoichiometric LiFeAs is an intrinsically electron-overdoped superconductor similar to those of the electron-overdoped NaFe1-xTxAs and BaFe2-xTxAs2 (T = Co,Ni). Furthermore, we show that although transport properties of the stoichiometric superconducting LiFeAs and Li-deficient nonsuperconducting Li1-xFeAs are different, their electronic and magnetic properties are rather similar. Therefore, the nonsuperconducting Li1-xFeAs is also in the electron overdoped regime, where small Li deficiencies near the FeAs octahedra can dramatically suppress superconductivity through the impurity scattering effect.

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