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WDX-Analysis of the New Superconductors RO(1-x)F(x)FeAs and Its Consequences on the Electronic Phase Diagram
Anke Köhler, Günter Behr
Polycrystalline samples of RO1-xFxFeAs (0 < x < 0.25) (R = La, Sm, Gd) were investigated by wavelength-dispersive X-ray spectroscopy (WDX) in the electron microscope to determine t…
Si-induced superconductivity and structural transformations in DyRh4B4
A. Köhler, G. Behr, G. Fuchs +2
DyRh4B4 has been known to crystallize in the primitive tetragonal (pt)-structure and to exhibit a ferromagnetic transition at 12 K, the highest magnetic transition temperature in t…
Morphology of the Superconducting Vortex Lattice in Ultra-Pure Niobium
S. Mühlbauer, C. Pfleiderer, P. Böni +5
The morphology of the superconducting flux line lattice (FLL) of Nb comprises gradual variations with various lock-in transitions and symmetry breaking rotations. We report a compr…
Electronic properties of LaOFFeAs in the normal state probed by NMR/NQR
H. -J. Grafe, G. Lang, F. Hammerath +12
We report 139La, 57Fe and 75As nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements on powders of the new LaO1-xFxFeAs superconductor for x = 0 and…
The intrinsic electronic phase diagram of iron-oxypnictide superconductors
C. Hess, A. Kondrat, A. Narduzzo +5
We present the first comprehensive derivation of the intrinsic electronic phase diagram of the iron-oxypnictide superconductors in the normal state based on the analysis of the ele…
Epitaxial growth and anisotropy of La(O,F)FeAs thin films deposited by Pulsed Laser Deposition
E. Backen, S. Haindl, T. Niemeier +5
LaFeAsO1-xFx thin films were deposited successfully on (001)-oriented LaAlO3 and MgO substrates from stoichiometric LaFeAsO1-xFx polycrystalline targets with fluorine concentration…