Dual Nature of a Ni Dopant in the Hole-Type La2−xSrxCuO4 Cuprate Superconductor
H. Hiraka, D. Matsumura, Y. Nishihata, J. Mizuki, K. Yamada
DOI 10.1103/PhysRevLett.102.037002 · Physical Review Letters
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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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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