Formation and mobility of oxygen vacancies in RuSr2GdCu2O8

Details Formation and mobility of oxygen vacancies in RuSr2GdCu2O8 Formation and mobility of oxygen vacancies in RuSr2GdCu2O8

2003-01-16

arxiv.org/abs/cond-mat/0301302v2

Phys. Rev. B 67, 144519 (2003)

Physics

Condensed Matter

Superconductivity

5 pages, 2 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.67.144519

Oxygen vacancies are introduced in the RuO2 and possibly CuO2 planes of RuSr2GdCu2O8 by annealing in vacuum above 600 K. The diffusive jumps of the O vacancies are accompanied by a reorientation of the local distortion, and are probed by measuring the elastic energy loss and modulus versus temperature at 1-10 kHz. An intense acoustic absorption peak develops near 670 K at 1 kHz and finally stabilizes after heating up to 920 K in vacuum. The analysis of the peak shows a barrier for the O diffusion of ~1.4 eV, and a slowing down of Curie-Weiss type, with Tc = 400-470 K, due to the interaction among the O vacancies. A secondary peak is attributed to O vacancies trapped at defects in the RuO2 planes, or to vacancies in the CuO2 planes. No sign of structural phase transformation is found up to 920 K.

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