Journal
PHYSICAL REVIEW B
Volume 86, Issue 14, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.144511
Keywords
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Funding
- MOST of China [2012CB821400, 2010CB833102, 1J2010CB923001]
- NSFC [11004233]
- US DOE BES [DE-FG02-05ER46202]
- Scientific User Facilities Division, BES, U.S. DOE
- University of Wisconsin-Madison
- University of Wisconsin-Milwaukee
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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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