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Josephson plasma in RuSr$_{2}$GdCu$_{2}$O$_{8}$,Ru$_{1-x}$Sr$_{2}$GdCu$_{2+x}$O$_{8}$ (x = 0.3), andRuSr$_{2}$Eu$_{2-x}$Ce$_{x}$Cu$_{2}$O$_{10}$ (x = 0.5) compounds isinvestigated by the sphere resonance method. The Josephson plasma is observedin a low-frequency region (around 8.5 cm$^{-1}$ at T $\ll$ $T_{c}$) forferromagnetic RuSr$_{2}$GdCu$_{2}$O$_{8}$, while it increases to 35 cm$^{-1}$for non-ferromagnetic Ru$_{1-x}$Sr$_{2}$GdCu$_{2+x}$O$_{8}$ (x = 0.3), whichrepresents a large reduction in the Josephson coupling at ferromagneticRuO$_{2}$ block layers. The temperature dependence of the plasma does not shiftto zero frequency ({\it i.e.} $j_{c}$ = 0) at low temperatures, indicating thatthere is no transition from the 0-phase to the $\pi$-phase in these compounds.The temperature dependence and the oscillator strength of the peak aredifferent from those of other non-magnetic cuprates, and the origins of theseanomalies are discussed.Comment: to appear in Phys. Rev.B Rapid Com

Josephson plasma in RuSr2GdCu2O8