Magnetic and structural transitions in layered FeAs systems: AFe2As2 versus RFeAsO compounds

Abstract

Resistivity, specific heat and magnetic susceptibility measurements performed on SrFe2As2 samples evidence a behavior very similar to that observed in LaFeAsO and BaFe2As2 with the difference that the formation of the SDW and the lattice deformation occur in a pronounced first order transition at T_0=205K. Comparing further data evidences that the Fe-magnetism is stronger in SrFe2As2 and in EuFe2As2 than in the other layered FeAs systems investigated up to now. Full potential LDA band structure calculations confirm the large similarity between the compounds, especially for the relevant low energy Fe 3d states. The relation between structural details and magnetic order is analyzed.

4 pages, 3 figures

References in corpus (5)

• Superconductivity at 41 K and its competition with spin-density-wave instability in layered CeO${}_{1-x}$F${}_x$FeAs
• Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
• Superconductivity at 25 K in hole doped $(L{a}_{1-x}S{r}_x)OFeAs$
• Commensurate Spin Density Wave in LaOFeAs: A Local Probe Study
• Synthesis and Properties of CaFe${}_2$As${}_2$ Single Crystals

Cited by in corpus (5)

• Superconductivity up to 37 K in (A1-xSrx)Fe2As2 with A=K and Cs
• Pressure-induced volume-collapsed tetragonal phase of CaFe2As2 as seen via neutron scattering
• Lattice and magnetic instabilities in CaFe2As2: A single crystal neutron diffraction study
• Structural transition and anisotropic properties of single crystalline SrFe2As2
• Strong coupling between magnetic and structural order parameters in SrFe2As2