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Suppression of superconductivity by V-doping and possible magnetic order in Sr2VO3FeAs

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 stoichiometries are determined by combined neutron- and x-ray powder diffraction. Sr2VO3FeAs is shown to be very sensitive to Fe/V mixing, which interferes with or even suppresses superconductivity. This inhomogeneity may be intrinsic and explains scattered reports regarding Tc and reduced superconducting phase fractions in Sr2VO3FeAs. Neutron diffraction data collected at 4 K indicates incommensurate mag- netic ordering of the V-sublattice with a propagation vector q = (0,0,0.306). This suggests strongly correlated vanadium, which does not contribute significantly to the Fermi surface of Sr2VO3FeAs.

preprint2010arXivOpen access
Marcus TegelTanja SchmidTobias StürzerMasamitsu EgawaYixi SuAnatoliy SenyshynDirk Johrendt
cond-mat.supr-concond-mat.str-el
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Marcus TegelTanja SchmidTobias StürzerMasamitsu EgawaYixi SuAnatoliy SenyshynDirk Johrendt

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