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arXiv 1008.2687cond-mat.supr-concond-mat.str-el
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V掺杂对Sr2VO3FeAs超导电性的抑制及可能的磁序

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

Marcus Tegel, Tanja Schmid, Tobias Stürzer, Masamitsu Egawa, Yixi Su, Anatoliy Senyshyn, Dirk Johrendt

摘要:

在Sr 2 VO 3 [Fe0.93(+/-0.01 $> V0.07(+/-0.01)]As中掺入少量的V完全抑制了Sr 2 VO 3 FeAs在33 K下的超导电性。的晶体结构和精确的化学计量确定相结合的中子和X射线粉末衍射。Sr_2VO_3FeAs对Fe/V混合非常敏感,这会干扰甚至抑制超导电性。这种不均匀性可能是内在的,并解释了分散的报告有关的Tc和减少超导相分数Sr 2 VO 3FeAs。在4K下收集的中子衍射数据表明V-亚晶格具有传播矢量q =(0,0,0.306)的无公度磁有序。这表明强烈相关的钒,这并没有显着贡献的费米面Sr 2 VO 3FeAs。

英文摘要:

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.

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