Ruthenocuprates: Intrinsic magnetic multilayers
Abstract
We report ac susceptibility measurements on polycrystalline samples of SrRuO3 and three ruthenocuprates: superconducting RuSr2GdCu2O8 (Ru-1212), superconducting RuSr2Eu(2-x)CexCu2Oy (Ru-1222, x=0.5) and nonsuperconducting, insulating RuSr2Eu(2-x)CexCu2Oz (Ru-1222, x=1.0). Ac susceptibility of both Ru-1222 compositions exhibit logarithmic time relaxation and `inverted' hysteresis loops. Ru-1212 samples exhibit none of these behaviors. We interpret the magnetic behavior of Ru-1222 in the framework of weakly coupled magnetic multilayers and argue that superconductivity coexists with qualitatively different magnetic behaviors.
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