Magnetic and transport properties of (La0,7Sr0,3)0,5(Pr0,65Ca0,35)0,5 MnO3 films prepared by a "co-deposition" utilizing the laser-ablation technique are investigated in a wide temperature range. The film deposited at 300 <$E symbol Р>C has a nano-crystalline disordered structure and exhibits a paramagnetic temperature dependence of the magnetization with a narrow peak (<$E DELTA T~symbol @~10> K) at <$E T sub G~symbol @~45> K, which can be interpreted as a paramagnetic <$E symbol О> superparamagnetic transition. A short-term annealing of the asdeposited film at 750 <$E symbol Р>C leads to the formation of a high-textured polycrystalline microstructure and to the appearance of ferromagnetic (FM) and metal - insulator (MI) transitions at <$E T sub C ~symbol @~240> К and <$E T sub P~symbol @~140> K, respectively. The observed discrepancy between <$E T sub P> and <$E T sub C> values can be ascribed to a percolating nature of the MI transition, with an exponent of 5,3 for the percolating conductivity. The film deposited at <$E T sub roman sub ~symbol @~740~symbol Р>C is composed of the lattice strain-free and the lattice-strained crystallites with different lattice parameters and <$E T sub C> ' s, and is consistently described in the framework of the Millis model [A.J. Millis, T. Darling, and A. Migliori, J. Appl. Phys. 83, 1588 (1998)]. For a single-phase crystalline film obtain <$E T sub C ~symbol @~270> К and <$E T sub P~symbol @~260> K.

Індекс рубрикатора НБУВ: В379.2

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Шифр НБУВ: Ж14063 Пошук видання у каталогах НБУВ 

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