Physical properties of Eu₃Ba₂Mn₂Cu₂O₁₂

Abstract

The physical properties of the manganocuprate compound, Eu₃Ba₂Mn₂Cu₂O₁₂ (Eu-3222) are investigated using X-ray diffraction, resistivity, magnetization and dielectric measurements. The structure of the Eu-3222 compound is made by the intermixing of Eu-123 (oxygen deficient triple perovskite block) and Eu-214 (K₂NiF₄ type single rock-salt like block). Electrical resistivity data show insulating behavior down to the measurable temperature and exhibits a conduction mechanism which can be explained on the basis of 3D variable range hopping model. Magnetization data shows a antiferromagnetic behavior at 5 K, however without any clear signature of magnetic ordering in the temperature range 5-300 K. Dielectric (Capacitance), measured as a function of temperature at various frequencies exhibits frequency dependence, indicating glassy relaxation of dipole moments.