2008/11/01 by Chandra Shekhar, Sonal Singh, P K Siwach +2 · 1 citation
Chemistry · Engineering · Materials Science · Physics and Astronomy · #Inorganic Fluorides and Related Compounds #Iron-based superconductors research #SAS software applications and methods #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1088/0953-2048/22/1/015005
published as Supercond. Sci. Technol. 22 (2009) 015005 · 5 pages, 5 figures. Accepted in Supercod. Sci Technol (2008)
arxiv created 2008/11/01 · openalex publication_date 2008/11/21 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
We report on the synthesis and structural/microstructural studies of iron-based fluorine doped LaOFeAs superconductors. We have successfully synthesized fluorine doped superconducting LaO 1− x F x FeAs materials by choosing lower temperature (∼1150 °C) and longer synthesis duration (∼60 h) as compared to the standard values of these employed in the pioneering first contribution (Kamihara et al 2008 J. Am. Chem. Soc. 130 3296). A decrease of lattice parameters, as determined by x-ray diffraction, confirms the substitution of fluorine. The superconducting transition temperature is 27.5 K which is observed at a doping level of x = 0.2. This superconducting material LaO 1− x F x FeAs exhibits interesting microstructural characteristics. These relate to the existence of another structural phase, besides the standard phase, having c parameters of ∼12.67 Å. This suggests the existence of a modulated structure, similar to the cuprates, in these new oxypnictides. This phase may have new impact on this new high- T C family.