Charge redistribution and local lattice structure of (F, Zn)-codoped LaFeAsO superconductor

Details Charge redistribution and local lattice structure of (F, Zn)-codoped LaFeAsO superconductor Charge redistribution and local lattice structure of (F, Zn)-codoped LaFeAsO superconductor

Mar 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012njph...14c3005c&link_type=abstract

New Journal of Physics, Volume 14, Issue 3, pp. 033005 (2012).

Physics

Scientific paper

To understand the abnormal behavior of the superconducting transition temperature (Tc) because of the presence of a non-magnetic Zn impurity in the (F, Zn)-codoped LaFeAsO system (Li et al 2010 New J. Phys. 12 083008), we investigated its unique electronic and local structures via x-ray absorption spectroscopy and first-principles calculations. The data obtained showed that the presence of a Zn impurity induces an electron transfer from As to Fe atoms in both the F-underdoped and -overdoped regions. Moreover, due to the lattice mismatch, the local lattice structure is finely modulated by both F and Zn impurities. Actually, in the F-underdoped region doping by Zn is associated with regular FeAs4 tetrahedra, while distorted FeAs4 tetrahedra occur in the F-overdoped region where superconductivity is significantly suppressed.

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