Abstract
The crystal structure and numerous normal and superconducting state properties of layered tetragonal LaFeAsO, with F doping of , are reported. Resistivity measurements give an onset transition temperature , and low field magnetic susceptibility data indicate bulk superconductivity. In applied magnetic field, analysis of the resistive transition results in a critical field and a coherence length . An upper limit for the electron carrier concentration of is inferred from the Hall data just above . Strong electron-electron correlations are suggested from temperature-dependent resistivity, Seebeck coefficient, and thermal conductivity data. Anomalies near are observed in both Seebeck coefficient and thermal conductivity data.
- Received 13 March 2008
DOI:https://doi.org/10.1103/PhysRevB.77.174503
©2008 American Physical Society