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We demonstrate the presence of ferromagnetic (FM) fluctuations in thesuperconducting and non-superconducting heavily overdoped regimes ofhigh-temperature superconducting copper oxides, using(Bi,Pb)_2_Sr_2_CuO_6+delta_ (Bi-2201) single crystals. Magnetization curvesexhibit a tendency to be saturated in high magnetic fields at low temperaturesin the heavily overdoped crystals, which is probably a precursor phenomenon ofa FM transition at a lower temperature. Muon spin relaxation detects theenhancement of spin fluctuations at high temperatures below 200 K.Correspondingly, the ab-plane resistivity follows a 4/3 power law in a widetemperature range, which is characteristic of metals with two-dimensional FMfluctuations due to itinerant electrons. As the Wilson ratio evidences theenhancement of spin fluctuations with hole doping in the heavily overdopedregime, it is concluded that two-dimensional FM fluctuations reside in theheavily overdoped Bi-2201 cuprates, which is probably related to the decreasein the superconducting transition temperature in the heavily overdopedcuprates.

Development of Ferromagnetic Fluctuations in Heavily Overdoped (Bi,Pb)_2_Sr_2_CuO_6+delta_ Copper Oxides