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Whereas resistivity and ac susceptibility measurements on the magnetic (Tm ~130 K) superconductor (Tc,onset ~ 50 K) RuSr2GdCu2O8 (Ru-1212Gd) reported bydifferent research groups reveal a universal behavior in its superconductingstate, this is not the case with the superconducting quantum interferencedevice (SQUID) magnetization measurements. The reported SQUID measurements inthe superconducting state of Ru-1212Gd reveal a variety of behaviors, leavingthe question of bulk superconductivity for this compound open. We reviewseveral of the reported behaviors by presenting measurements done on oursamples belonging to the same batch. Based on the observed sensitivity ofRu-1212Gd to magnetic field inhomogeneities when it is moved in thesuperconducting magnet of the SQUID magnetometer during the measurements, wesuggest that the reported different behaviors can be the result of differentfield profiles in the superconducting magnet and not of differentsuperconducting properties. In order to avoid the artifacts arising from movingthe sample in an inhomogeneous field, we did measurements on a stationaryRu-1212Gd sample employing a home made SQUID magnetometer. The measured curvesshowed none of the suspicious ``symptoms'' present in the curves measured witha magnetometer employing sample movement (e.g. no reversal of the featuresobserved in the superconducting state of Ru-1212Gd by a field reversal) and ifverified by measurements on stationary samples by other groups a universalbehavior in the superconducting state of Ru-1212Gd can be revealed by the SQUIDmeasurements too. Our considerations support the existence of bulksuperconductivity for Ru-1212Gd.Comment: 21 pages, 9 figure

physical review. b, condensed matter

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Towards universal magnetization curves in the superconducting state ofRuSr2GdCu2O