| Autor: |
H, Hiraka, D, Matsumura, Y, Nishihata, J, Mizuki, K, Yamada |
| Rok vydání: |
2008 |
| Zdroj: |
Physical review letters. 102(3) |
| ISSN: |
0031-9007 |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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