Physics – Condensed Matter – Superconductivity
Scientific paper
2008-07-22
Physics
Condensed Matter
Superconductivity
8 pages, 2 figures
Scientific paper
10.1016/j.physc.2008.10.003
We report the first-principle FLAPW-GGA calculations of the elastic properties of two related layered phases, namely, the ternary arsenide SrFe2As2 and the quaternary oxyarsenide LaFeAsO - basic phases for the newly discovered "122" and "1111" 38-55K superconductors. The independent elastic constants (Cij), bulk moduli, compressibility, and shear moduli are evaluated and discussed. The numerical estimates of the elastic parameters of the polycrystalline SrFe2As2 and LaFeAsO ceramics are performed for the first time. Additionally, the peculiarities of chemical bonding in these phases are discussed.
Ivanovskii Alexander L.
Shein Igor R.
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