Delocalization of the Cu2+ Unpaired Electron on the Next Nearest Ligands in Sr2Pd0.99Cu0.01O3 Ceramics

M.A. Augustyniak-Jabłokow a, Y.V. Yablokov a, I. Jacyna-Onyszkiewicz b, T.A. Ivanova c, V.A. Shustov c and V.K. Polovniak d a Institute of Molecular Physics, PAS, Smoluchowskiego 17, 60-179 Poznań, Poland b Institute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland c Kazan Physical Technical Institute, RAS, Sibirskii trakt 10/7, 420 029 Kazan, Russia d Kazan Technological Institute, Sibirskii trakt 12, 420 029 Kazan, Russia

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Received: 6 11 2007;

Supertransferred hyperfine interactions between the Cu2+ unpaired electron and the 105Pd nuclei in the Sr2Pd0.99Cu0.01O3 ceramic were studied by the EPR method. The spectrum of isolated -Pd-O-CuO2-O-Pd- units ( g∥=2.280 ± 0.001; g⊥= 2.040 ± 0.001; A∥( 63Cu ) = 13 mT ± 0.1; A∥( 65Cu ) = 13.9 ± 0.1 mT; A⊥( 63,65Cu ) = 0.0 mT ) overlaps the signal from small groups of exchange coupled Cu2+ ions ( g∥ = 2.278 ± 0.002; g⊥= 2.041 ± 0.001 ). The isotropic contribution was shown to dominate in the Cu-Pd supertransferred interactions ( A∥( 105Pd ) = A⊥( 105Pd ) = 1 mT = aiso Pd ).

DOI: 10.12693/APhysPolA.114.197 PACS numbers: 33.15.Pw, 73.20.Jc, 76.30.Fc