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Competition of magnetism and superconductivity in underdoped (Ba1-xKx)Fe2As2
Marianne Rotter, Marcus Tegel, Inga Schellenberg +7
Polycrystalline samples of underdoped (Ba1-xKx)Fe2As2 (x<=0.4) were synthesized and studied by x-ray powder diffraction, magnetic susceptibility, specific heat and 57Fe-Moessbauer-…
Phonon dynamics in Sr0.6K0.4Fe2As2 and Ca0.6Na0.4Fe2As2
R. Mittal, Y. Su, S. Rols +6
We report inelastic neutron scattering measurements of the phonon density-of-states in superconducting Sr0.6K0.4Fe2As2 (Tc=30 K) and Ca0.6Na0.4Fe2As2 (Tc=18 K). Compared with the p…
Synthesis, crystal structure and spin-density-wave anomaly of the iron arsenide-fluoride SrFeAsF
M. Tegel, S. Johansson, V. Weiss +4
The new quaternary iron arsenide-fluoride SrFeAsF with the tetragonal ZrCuSiAs-type structure was synthesized and the crystal structure was determined by X-ray powder diffraction (…
Superconductivity and Crystal Structures of (Ba1-xKx)Fe2As2 (x = 0 - 1)
Marianne Rotter, Michael Pangerl, Marcus Tegel +1
We report on doping dependencies of structural parameters and superconducting transition temperatures in the solid solution (Ba1-xKx)Fe2As2. As the main effect of doping on the cry…
Spin density wave anomaly at 140 K in the ternary iron arsenide BaFe2As2
Marianne Rotter, Marcus Tegel, Inga Schellenberg +3
The ternary iron arsenide BaFe2As2 with the tetragonal ThCr2Si2-type structure exhibits a spin density wave (SDW) anomaly at 140 K, very similar to LaFeAsO, the parent compound of…
Structural and magnetic phase transitions in the ternary iron arsenides SrFe2As2 and EuFe2As2
Marcus Tegel, Marianne Rotter, Veronika Weiss +3
The structural and magnetic phase transitions of the ternary iron arsenides SrFe2As2 and EuFe2As2 were studied by temperature-dependent x-ray powder diffraction and 57-Fe Moessbaue…