Abstract
We report the synthesis of LaOFeAs based oxypnictide superconductors (La 1− x Na x O 1− x F x FeAs) using sodium fluoride as a fluorinating agent. NaF doping leads to a systematic decrease in both the a and c lattice parameters. Resistivity measurements show the onset resistivity transition temperature at 30.9 (±0.05) K and corresponding Meissner transition at 28 (±0.05) K in La 0.85Na 0.15O 0.85F 0.15FeAs which is highest in LaOFeAs type superconductors synthesized at ambient pressure. Further increase of NaF content in LaOFeAs leads to suppression of T c. The above superconductors show a negative value of the Seebeck coefficient which indicates that electrons are the dominant charge carriers.
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