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Oxygen vacancies are introduced in the RuO2 and possibly CuO2 planes ofRuSr2GdCu2O8 by annealing in vacuum above 600 K. The diffusive jumps of the Ovacancies are accompanied by a reorientation of the local distortion, and areprobed by measuring the elastic energy loss and modulus versus temperature at1-10 kHz. An intense acoustic absorption peak develops near 670 K at 1 kHz andfinally stabilizes after heating up to 920 K in vacuum. The analysis of thepeak shows a barrier for the O diffusion of ~1.4 eV, and a slowing down ofCurie-Weiss type, with Tc = 400-470 K, due to the interaction among the Ovacancies.  A secondary peak is attributed to O vacancies trapped at defects in the RuO2planes, or to vacancies in the CuO2 planes. No sign of structural phasetransformation is found up to 920 K.Comment: 5 pages, 2 figures, submitted to Phys. Rev.

physical review. b, condensed matter

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Formation and mobility of oxygen vacancies inRuSr2GdCu2O<…