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

Meng Wang; Miaoyin Wang; Hu Miao; S. V. Carr; D. L. Abernathy; M. B. Stone; X. C. Wang; Lingyi Xing; C. Q. Jin; Xiaotian Zhang; Jiangping Hu; Tao Xiang; Hong Ding; Pengcheng Dai

doi:10.1103/PhysRevB.86.144511

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

Meng Wang, Miaoyin Wang, Hu Miao, S. V. Carr, D. L. Abernathy, M. B. Stone, X. C. Wang, Lingyi Xing, C. Q. Jin, Xiaotian Zhang, Jiangping Hu, Tao Xiang, Hong Ding, Pengcheng Dai

DOI 10.1103/PhysRevB.86.144511 · Physical Review B

T1

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Abstract

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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LiFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	16	Pressure unresolved	onset
LiFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	17	Pressure not reported	unknown