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Superconducting properties of RuSr2GdCu2O8 studied by SQUID magnetometry

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arxiv cond-mat/0205463 v1 pith:UETCBYD2 submitted 2002-05-22 cond-mat.supr-con

Thomas P. Papageorgiou , Hans F. Braun , Thomas Herrmannsdoerfer This is my paper · ORCID
classification cond-mat.supr-con
keywords ru-1212magnetizationpeakssquidsr-2116superconductingcompoundmeasurement
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For polycrystalline RuSr2GdCu2O8 (Ru-1212), distinct peaks have been reported in d.c. magnetization in the superconducting state of the sample. Sr2GdRuO6 (Sr-2116), the precursor for the preparation of Ru-1212, shows similar peaks in the same temperature regime. Based on measurements performed on both bulk and powdered samples of Ru-1212 and Sr-2116, we exclude the possibility, that the observed 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 an intrinsic property of this compound. We provide evidence that the observation of magnetization peaks in the superconducting state of Ru-1212 is due to flux motion 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 magnetization measurement of Ru-1212 represent a property of the compound or not.

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