Physics
Scientific paper
Aug 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010njph...12h3050z&link_type=abstract
New Journal of Physics, Volume 12, Issue 8, pp. 083050 (2010).
Physics
Scientific paper
A comprehensive study of the difference between CaFe1-xNixAsF and CaFe1-xCoxAsF systems has been carried out by measuring the efficient charge carrier concentration, the valence states and the superconducting phase diagram. It is found that at the same doping level, Ni doping introduces nearly twice the number of charge carriers as Co doping. However, x-ray absorption near-edge spectroscopy measurements reveal that the valence state of Fe in both systems is close to 2, indicating that there is no valence mismatch. We suggest that the charge carriers in CaFe1-xMxAsF (M=transition metal elements) are not induced by valence mismatch but come from the difference in the number of outer-shell electrons. We also suggest that with Ni and Co doping, the systems change from a multi-band material in the underdoped regions to a single-band state in the overdoped regions.
Ling Langsheng
Qu Zhe
Tan Shun
Xi Chuanying
Yi Yu
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