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    Phys Rev Lett. 2009 Jan 23;102(3):037002. Epub 2009 Jan 21.

    Dual nature of a Ni dopant in the hole-type La2-xSrxCuO4 cuprate superconductor.

    Hiraka H, Matsumura D, Nishihata Y, Mizuki J, Yamada K.

    Source

    Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.

    Abstract

    Local distortions around a Ni dopant in the hole-type La2-xSrxCuO4 superconductor system were studied by x-ray-absorption fine structure (XAFS) using single crystals over a wide hole-doping range. Two distinct interatomic distances between Ni and in-plane oxygen appear in the Ni K-edge extended XAFS. Combined with previous results on hole-localization effects by Ni doping, two types of charge states are strongly indicated for Ni. This duality disqualifies a magnetic-impurity picture for Ni dopant in the superconducting phase of cuprates.

    PMID:
    19257382
    [PubMed]

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