Ruthenocuprates: Intrinsic magnetic multilayers
Zivkovic, I. · Hirai, Y. · Prester, M. · Drobac, D. · Ariosa, D. · Margaritondo, G. · Felner, I. · Frazer, B. H. · Onellion, M.
Original · EN
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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