Abstract
Resistivity, specific-heat, and magnetic-susceptibility measurements performed on samples evidence a behavior very similar to that observed in LaFeAsO and , with the difference being that the formation of the spin-density wave and the lattice deformation occur in a pronounced first-order transition at . Comparing further data evidences that the Fe magnetism is stronger in and in than in the other layered FeAs systems investigated up to now. Full potential local-density approximation band-structure calculations confirm the large similarity between the compounds, especially for the relevant low energy states. The relation between structural details and magnetic order is analyzed.
- Received 6 June 2008
DOI:https://doi.org/10.1103/PhysRevB.78.100504
©2008 American Physical Society