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Unification of the Electronic Phase Diagrams of the RO1−xFxFeAs-Compounds by Using the Real Fluorine Content

Published online by Cambridge University Press:  21 April 2011

A. Köhler  and
G. Behr
A. Köhler
Affiliation:
Institute for Solid State and Materials Research, IFW Dresden, P.B. 270116 Dresden, Germany TU Bergakademie Freiberg, Leipziger Str. 29, D-095996 Freiberg, Germany
G. Behr
Affiliation:
Institute for Solid State and Materials Research, IFW Dresden, P.B. 270116 Dresden, Germany
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Abstract

Measurements of the actual fluorine content x in the RO1−xFxFeAs-samples by wavelength-dispersive X-ray spectroscopy (WDX) reveal sample dependent discrepancies to the nominal fluorine content (initial weight). In particular for SmO1−xFxFeAs, the measured value only reached approximately half of the required value. In the lanthanum compound LaO1−xFxFeAs, we found a good agreement mainly for x>0.05, but the fluorine hardly goes into the sample for x<0.05. We used the measured fluorine content when plotting the electronic phase diagrams again and find a more consistent picture occurs as well for our samples as for comparison with the divers published data.

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