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Dual nature of a Ni dopant in the hole-type La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ cuprate superconductor

Hiraka, Haruhiro*; Matsumura, Daiju; Nishihata, Yasuo; Mizuki, Junichiro; Yamada, Kazuyoshi*

Local distortions around a Ni dopant in the hole-type La$$_{2-x}$$Sr$$_{x}$$CuO$$_{4}$$ 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.

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Category:Physics, Multidisciplinary

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