Magnetic and transport properties controlled by structural disorder in La0.7Ca0.3MnO3 films

Автор(и)

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

DOI (Low Temperature Physics):


https://doi.org/10.1063/1.1802954

Ключові слова:

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

Анотація

The magnetic properties of an amorphous, a partially-disordered, and a lattice-strained crystalline La0.7 Ca0.3 MnO3 film are investigated. It is shown that the amorphous film exhibits Curie- Weiss-type paramagnetism with the effective magnetic moment of 4.2 mB/Mn ion and a small ferromagnetic contribution governed by the formation of a quasi-two-dimensional crystalline interfacial inclusions. The crystalline film with nanocrystalline randomly-oriented inclusions demonstrates a superposition of ferromagnetic (in the crystalline matrix) and superparamagnetic (in the inclusions) nature. The fitted average size of the superparamagnetic particles in the case of a Langevin function is coincident with that of the nanocrystalline clusters reveated in high-resolution electron-microscopy images. An increase in the applied magnetic field leads to a reduction in the average magnetic moment of superparamagnetic particles, which is due to an enhancement of the ferromagnetic coupling between the individual randomly-oriented crystallites. The completely crystalline film undergoes only a ferromagnetic transition with a saturation magnetization at 5 K of 2.73 mB/Mn ion.

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Опубліковано

2004-07-20

Як цитувати

(1)
V.G. Prokhorov, V.A. Komashko, G.G. Kaminsky, V.L. Svetchnikov, Y.P. Lee, and S.Y. Park, Magnetic and transport properties controlled by structural disorder in La0.7Ca0.3MnO3 films, Low Temp. Phys. 30, (2004) [Fiz. Nizk. Temp. 30, 938-944, (2004)] DOI: https://doi.org/10.1063/1.1802954.

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Низькотемпературний магнетизм

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