Influence of structural disorder on magnetic and transport properties of (La0.7Sr0.3)0.5(Pr0.65Ca0.35)0.5MnO3 films

Автор(и)

  • V.G. Prokhorov Institute of Metal Physics, National Academy of Sciences of Ukraine, Kiev, 03142, Ukraine
  • V.S. Flis Institute of Metal Physics, National Academy of Sciences of Ukraine, Kiev, 03142, Ukraine
  • G.G. Kaminsky Institute of Metal Physics, National Academy of Sciences of Ukraine, Kiev, 03142, Ukraine
  • Y.P. Lee Quantum Photonic Science Research Center and Department of Physics, Hanyang University Seoul, 133-791 Korea
  • J.S. Park Quantum Photonic Science Research Center and Department of Physics, Hanyang University Seoul, 133-791 Korea
  • V.L. Svetchnikov National Center of High-Resolution Electron Microscopy Rotterdamseweg 137, 2628AL, Delft, The Netherlands

DOI (Low Temperature Physics):


https://doi.org/10.1063/1.1820566

Ключові слова:

PACS: 71.30. h, 75.47.Gk, 75.47.Lx

Анотація

Magnetic and transport properties of (La0.7Sr0.3)0.5(Pr0.65Ca0.35)0.5MnO3) films prepared by a «co-deposition» utilizing the laser-ablation technique are investigated in a wide temperature range. The film deposited at 300˚C has a nano-crystalline disordered structure and exhibits a paramagnetic temperature dependence of the magnetization with a narrow peak (DT ≃ 10 K) at TG ≃ 45 K, which can be interpreted as a paramagnetic → superparamagnetic transition. A short-term annealing of the as-deposited film at 750 ˚C leads to the formation of a high-textured polycrystalline microstructure and to the appearance of ferromagnetic (FM) and metal—insulator (MI) transitions at TC ≃ 240 K and TP ≃ 140 K, respectively. The observed discrepancy between TP and TC 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 Tsub ≃ 740 ˚C is composed of the lattice strain-free and the lattice-strained crystallites with different lattice parameters and TCs, 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 TC ≃ 270 K and TP ≃ 260 K.

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Опубліковано

2004-12-29

Як цитувати

(1)
V.G. Prokhorov, V.S. Flis, G.G. Kaminsky, Y.P. Lee, J.S. Park, and V.L. Svetchnikov, Influence of structural disorder on magnetic and transport properties of (La0.7Sr0.3)0.5(Pr0.65Ca0.35)0.5MnO3 films, Low Temp. Phys. 31, (2004) [Fiz. Nizk. Temp. 31, 213-221, (2004)] DOI: https://doi.org/10.1063/1.1820566.

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Низькотемпературний магнетизм

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