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:

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)
Prokhorov, V.; Komashko, V.; Kaminsky, G.; Svetchnikov, V.; Lee, Y.; Park, S. Magnetic and Transport Properties Controlled by Structural Disorder in La0.7Ca0.3MnO3 Films. Fiz. Nizk. Temp. 2004, 30, 938-944.

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Низькотемпературний магнетизм

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