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Mössbauer study of partially ordered cobaltites Nd2CoMnO6+δ with perovskite structure

The properties of Nd2CoMnO6+δ (δ = 0, 0.12) samples were investigated by Mössbauer, μSR and magnetization measurements. Our experimental data were interpreted in the following model. The samples consist mainly of clusters of cobalt and manganese ions with different degrees of order. The valence state of these ions is predominantly Co2+/Mn4+. Increasing the oxygen content leads to an enhancement of the disordered fraction of the sample which contains mainly three-valent ions. The highly ordered stoichiometric (δ = 0) compound exhibits both pronounced ferromagnetic and weak spin-glass-like components. Ionic disordering leads to a partial destruction of the ferromagnetic component and to strong enhancement of the spin-glass-like one in non-stoichiometric (δ = 0.12) samples. The spin-glass-like component transforms into the ferromagnetic one as a first-order metamagnetic phase transition in an external magnetic field.