Magnetic and transport properties controlled by structural disorder in La0.7Ca0.3MnO3 films
DOI (Low Temperature Physics):
https://doi.org/10.1063/1.1802954Ключові слова:
PACS: 71.30. h, 75.47.Gk, 75.47.LxАнотація
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
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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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