Physics – Condensed Matter – Superconductivity
Scientific paper
2008-04-22
Supercond. Sci. Technol. 21 (2008) 125028
Physics
Condensed Matter
Superconductivity
22 pages, 8 figures, 2 tables, Supplementary information is included at the end of the document, accepted for publication in S
Scientific paper
10.1088/0953-2048/21/12/125028
Undoped LaFeAsO, parent compound of the newly found high-Tc superconductor, exhibits a sharp decrease in the temperature-dependent resistivity at ~160 K. The anomaly can be suppressed by F doping and the superconductivity appears correspondingly, suggesting a close associate of the anomaly with the superconductivity. We examined the crystal structures, magnetic properties and superconductivity of undoped (normal conductor) and 14 at.% F-doped LaFeAsO (Tc = 20 K) by synchrotron X-ray diffraction, DC magnetic measurements, and ab initio calculations to demonstrate that the anomaly is associated with a phase transition from tetragonal (P4/nmm) to orthorhombic (Cmma) phases at ~160 K as well as an antiferromagnetic transition at ~140 K. These transitions can be explained by spin configuration-dependent potential energy surfaces derived from the ab initio calculations. The suppression of the transitions is ascribed to interrelated effects of geometric and electronic structural changes due to doping by F- ions.
Hirano Masahiro
Hosono Hideo
Kamihara Yoichi
Kato Kenichi
Kim Sung Wng
No associations
LandOfFree
Crystallographic Phase Transition and High-Tc Superconductivity in LaFeAsO:F does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Crystallographic Phase Transition and High-Tc Superconductivity in LaFeAsO:F, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Crystallographic Phase Transition and High-Tc Superconductivity in LaFeAsO:F will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-675829