EXAFS spectroscopy of perovskite-type superconducting oxides |
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Authors: | A. P. Menushenkov K. V. Klement’ev R. V. Chernikov |
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Affiliation: | (1) Moscow Engineering Physics Institute, Kashirskoe sh. 31, Moscow, 115409, Russia;(2) HASYLAB, DESY, D-22607 Hamburg, Germany |
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Abstract: | On the basis of the investigation of the temperature dependences of EXAFS spectra of the Ba1?x K x BiO3 superconducting oxide, a model of relationship between the local crystalline and electronic structures is proposed. It is found that oxygen ions vibrate in a double-well potential and their vibrations are correlated with the local electron pair transfer. Analogous specific features are also observed in the EXAFS spectra of La2?x Sr x CuO4, which gives grounds to extend the proposed model to Cu-based superconductors. The model based on the unified approach makes it possible to explain the ground antiferromagnetic state, the insulator-metal transition, and the occurrence of superconductivity upon doping of La2CuO4 with strontium. |
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