Ruthenocuprates: Intrinsic magnetic multilayers

B.H.Frazer; D.Ariosa; D.Drobac (Zagreb); G.Margaritondo (Lausanne); I.Felner (Jerusalem); I.Zivkovic (Zagreb); M.Onellion (Madison); M.Prester; Y.Hirai (Madison)

arxiv: cond-mat/0107388 · v2 · submitted 2001-07-18 · ❄️ cond-mat.supr-con · cond-mat.str-el

Ruthenocuprates: Intrinsic magnetic multilayers

I.Zivkovic (Zagreb) , Y.Hirai (Madison) , M.Prester , D.Drobac (Zagreb) , D.Ariosa , G.Margaritondo (Lausanne) , I.Felner (Jerusalem) , B.H.Frazer

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M.Onellion (Madison)

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classification ❄️ cond-mat.supr-con cond-mat.str-el

keywords magneticru-1222rusrbehaviorsexhibitmultilayersru-1212ruthenocuprates

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We report ac susceptibility measurements on polycrystalline samples of SrRuO_3 and three ruthenocuprates: superconducting RuSr_2GdCu_2O_8 (Ru-1212), superconducting RuSr_2Eu_(2-x)Ce_xCu_2O_y (Ru-1222, x=0.5) and nonsuperconducting, insulating RuSr_2Eu_(2-x)Ce_xCu_2O_z (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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Ruthenocuprates: Intrinsic magnetic multilayers

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