Abstract
The properties of Nd2CoMnO6+δ (δ = 0, 0.12) samples were investigated by Mössbauer,μSR and magnetization measurements. Our experimental data were interpreted in thefollowing model. The samples consist mainly of clusters of cobalt and manganese ionswith different degrees of order. The valence state of these ions is predominantlyCo2+/Mn4+. Increasing the oxygen content leads to an enhancement of the disordered fraction of thesample which contains mainly three-valent ions. The highly ordered stoichiometric(δ = 0) compound exhibits both pronounced ferromagnetic and weak spin-glass-likecomponents. Ionic disordering leads to a partial destruction of the ferromagneticcomponent 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 afirst-order metamagnetic phase transition in an external magnetic field.
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