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Comprehensive measurements of dc and ac susceptibility, dc resistance,magnetoresistance, Hall resistivity, and microwave absorption and dispersion infields up to 8 T have been carried out on RuSr_2GdCu_2O_8 with the aim toestablish the properties of RuO_2 and CuO_2 planes. At ~130 K, where themagnetic order develops in the RuO_2 planes, one observes a change in the slopeof dc resistance, change in the sign of magnetoresistance, and the appearanceof an extraordinary Hall effect. These features indicate that the RuO_2 planesare conducting. A detailed analysis of the ac susceptibility and microwave dataon both, ceramic and powder samples show that the penetration depth remainsfrequency dependent and larger than the London penetration depth even at lowtemperatures. We conclude that the conductivity in the RuO_2 planes remainsnormal even when superconducting order is developed in the CuO_2 planes below\~45 K. Thus, experimental evidence is provided in support of theoreticalmodels which base the coexistence of superconductivity and magnetic order ondecoupled CuO_2 and RuO_2 planes.Comment: 11 pages, 11 figures, submitted to PR

physical review. b, condensed matter

Decoupled<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CuO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">RuO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>layers in superconducting and …

DecoupledCuO2andRuO2layers in superconducting and …