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:

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)
Prokhorov, V.; Flis, V.; Kaminsky, G.; Lee, Y.; Park, J.; Svetchnikov, V. Influence of Structural Disorder on Magnetic and Transport Properties of (La0.7Sr0.3)0.5(Pr0.65Ca0.35)0.5MnO3 Films. Fiz. Nizk. Temp. 2004, 31, 213-221.

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Низькотемпературний магнетизм

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