Abstract
CaCu3Ru4O12 is a Pauli paramagnetic metal oxide consisting of both 3d and 4d magnetic ions in a Cubic-perovskite crystal structure. This present work probes a change in magnetic ground state with the influence of Co. Polycrystalline CaCu3Ru4-xCoxO12 (0 ≤ x ≤ 0.1) powder samples have been prepared by conventional solid state reaction under ambient condition. X-ray photoelectron spectroscopy suggests the formation of Cu3+ and Co3+ ions. The absence of electron paramagnetic resonance (EPR) signal for x = 0.1 also confirms the presence of low spin Cu3+ in doped system. Partial replacement of Ru4+ by Co3+ leads to a transition from itinerant Pauli to localized paramagnetism. Resistivity follows Fermi liquid behavior at low temperature.
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