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Superconductivity up to 35 K in the iron-platinum arsenides (CaFe1-xPtxAs)10Pt4-yAs8 with layered structures
Catrin Löhnert, Tobias Stürzer, Marcus Tegel +3
We report the synthesis and crystal structures of three new superconducting iron-platinum arsenides (CaFe1-xPtxAs)10Pt4-yAs8 (x = 0-0.15, y = 0-0.4). The structures are stacking va…
Suppression of superconductivity by V-doping and possible magnetic order in Sr2VO3FeAs
Marcus Tegel, Tanja Schmid, Tobias Stürzer +4
Superconductivity at 33 K in Sr2VO3FeAs is completely suppressed by small amounts of V-doping in Sr2VO3[Fe0.93(+/-0.01)V0.07(+/-0.01)]As. The crystal structures and exact stoichiom…
The crystal structure of FeSe0.44Te0.56
Marcus Tegel, Catrin Loehnert, Dirk Johrendt
The crystal structure of the superconductor FeSe0.44Te0.56 was redetermined by high-resolution X-ray single crystal diffraction at 173 K (anti-PbO-type, P4/nmm, a=3.7996(2), c=5.98…
Low Temperature Crystal Structure and 57Fe Moessbauer Spectroscopy of Sr3Sc2O5Fe2As2
Marcus Tegel, Inga Schellenberg, Franziska Hummel +2
The crystal structure of the layered iron arsenide Sr3Sc2O5Fe2As2 was determined between 300 and 10 K. The lattice parameters of the tetragonal cell decrease anisotropically accord…
The layered iron arsenides Sr2CrO3FeAs and Ba2ScO3FeAs
Marcus Tegel, Franziska Hummel, Sebastian Lackner +3
Polycrystalline samples of the layered iron arsenides Sr2CrO3FeAs and Ba2ScO3FeAs were synthesized by high temperature solid state reactions and their crystal structures determined…
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…
A 57Fe Moessbauer Spectroscopy Study of the 7 K Superconductor LaFePO
Marcus Tegel, Inga Schellenberg, Rainer Pöttgen +1
A polycrystalline sample of superconducting LaFePO was prepared in a tin flux at 1123 K. The structure was determined from single crystal data (ZrCuSiAs-type, P4/nmm, a = 3.9610(1)…
Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
Marianne Rotter, Marcus Tegel, Dirk Johrendt
The ternary iron arsenide BaFe2As2 becomes superconducting by hole doping, which was achieved by partial substitution of the barium site with potassium. We have discovered bulk sup…