Abstract
Abstract
The local lattice and electronic structures of CaFe1−xCoxAsF (x = 0, 0.15) are investigated by Fe K-edge and As K-edge x-ray-absorption near-edge structure and extended x-ray-absorption fine structure from 10 to 300 K. A redistribution of electron density of state between Fe(Co) and As atoms with decreasing temperature has been found in CaFe0.85Co0.15AsF, resulting in the increase of local density of state near the Fe site. It is found that the doping of Co introduces large static local lattice disorders of the As–Fe(Co) bonds. When we examine the local lattice structure around the Co dopants, we find the static local disorder is much more serious in the Co–As bonds comparing to that of As–Fe(Co) bonds. These facts suggest that strong electron-lattice interaction coexists with superconductivity in Fe-based superconductors.
Funder
the Natural Science Foundation of Anhui Province
National Natural Science Foundation of China
Subject
Metals and Alloys,Polymers and Plastics,Surfaces, Coatings and Films,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
5 articles.
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