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RuSr2(LnCe2)Cu2O12.25 (Ru-1232) compounds with Ln = Y and Dy beingsynthesized by high pressure high temperature (6GPa, 12000C) solid statesynthesis route do crystallize in space group P4/mmm in near single phase formwith small quantities of SrRuO3 and RuSr2(RE1.5Ce0.5)Cu2O10 (Ru-1222). Bothsamples exhibit magnetic transitions (Tmag.) at ~90 K with significantbranching of zfc (zero-field-cooled) and fc (field-cooled) magnetization and asharp cusp in zfc at ~ 70 K, followed by superconducting transitions at ~ 30 K.Both compounds show typical ferromagnetic hysteresis loops in magnetic moment(M) versus field (H) magnetization right upto Tmag. i.e. < 90K. To ourknowledge these are the first successfully synthesized Ru-1232 compounds innear single phase with lanthanides including Y and Dy. The results are comparedwith widely reported Gd/Ru-1222 and Ru-1212 (RuSr2GdCu2O8) compounds. Inparticular, it seems that the Ru moments magnetic ordering temperature (Tmag.)scales with the c-direction distance between magnetic RuO6 octahedras inRu-1212/1222 or 1232 systems.Comment: 15 pages of TEXT and Fig

High pressure high temperature synthesis and magnetization of magneto-superconducting RuSr2(LnCe2)Cu2O12.25 (Ru-1232) compounds (Ln=Y and Dy)