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For polycrystalline RuSr2GdCu2O8 (Ru-1212), distinct peaks have been reportedin d.c. magnetization in the superconducting state of the sample. Sr2GdRuO6(Sr-2116), the precursor for the preparation of Ru-1212, shows similar peaks inthe same temperature regime. Based on measurements performed on both bulk andpowdered samples of Ru-1212 and Sr-2116, we exclude the possibility, that theobserved behavior of the magnetization of Ru-1212 is due to Sr-2116 impurities.The effect is related to the superconductivity of Ru-1212, but it is not anintrinsic property of this compound. We provide evidence that the observationof magnetization peaks in the superconducting state of Ru-1212 is due to fluxmotion generated by the movement of the sample in an inhomogeneous field,during the measurement in the SQUID magnetometer. We propose several tests,that help to decide, whether the features observed in a SQUID magnetizationmeasurement of Ru-1212 represent a property of the compound or not.Comment: 22 pages, 9 figure

physical review. b, condensed matter

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SuperconductingRuSr2GdCu2O8