Nano-dimensional effects, such as electronic phase separation and charge ordering, play an important role in GMR-manganites. These effects are associated with superexchange interaction between Mn(III) and Mn(IV) atoms in perovskite structure. The correlations between properties of La_1-xA_xMnO₃ (A - Sr, Ba) and their electronic structure are still under investigations. Problems yet to be solved include determination of local electron parameters in three-dimensional oxides. The study of low-dimensional systems such as two-dimensional perovskite-like diluted manganites based on La_0.75Sr_1.25 MnO₄ is expected to have a solution to this problem. La_0.75Sr_1.25 MnO₄ complex oxide contains heterovalent manganese atoms and the same type of exchange interactions. In this study the homogeneous solid solutions y(La_0.75Sr_1.25MnO₄) - (1-y)LaSrAlO₄ (0.0041<y<0.093) with K₂NiF₄ structure were synthesized by solid state reaction. The phase in the final product was determined by XRD. Inter-atomic distances were calculated from structure refinements performed by the Rietveld method. Magnetic susceptibility and ESR spectroscopy were used to characterize the samples. According to the results of magnetic susceptibility measurements a strong tendency to clustering in perovskite layers was observed. Thus, the local distribution of electron density was changed. The origin of such phenomenon and its influence on the properties of manganities will be discussed in details.
This work is supported by Russian Foundation of Basic Researches (Grant 03-03-32355).

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