Abstract
Nanocrystalline La0.15Ca0.85MnO3 samples of various grain sizes ranging from ∼17 to 42 nm have been prepared by sol-gel technique. Phase purity and composition were verified by room temperature x-ray diffraction and SEM-EDAX analysis. the bulk La0.15Ca0.85MnO3 is known to order antiferromagnetically around 170 K and to undergo a simultaneous crystal structural transition. DC magnetization measurements on 17 nm size La0.15Ca0.85MnO3 show a peak at ∼130 K (T N) in zero-field-cooled (ZFC) state. Field-cooled magnetization bifurcates from ZFC data around 200 K hinting a weak ferromagnetic component near room temperature due to surface moments of the nanoparticle sample. Low temperature powder neutron diffraction experiments reveal that the incomplete structural transition from room temperature orthorhombic to low temperature orthorhombic-monoclinic state also occurs in the nanoparticle sample as in the bulk. Magnetization in the ordered state decreases as particle size increases, thus indicating the reduction of the competing ferromagnetic surface moments. © 2012 American Institute of Physics.
Recommended Citation
R. Thomas and G. Das and R. Mondal and R. Pradheesh and R. N. Mahato and T. Geetha Kumary and R. Nirmala and A. V. Morozkin and J. Lamsal and W. B. Yelon and A. K. Nigam and S. K. Malik, "Size Effect on the Structural, Magnetic, and Magnetotransport Properties of Electron Doped Manganite La 0.15Ca 0.85MnO 3," Journal of Applied Physics, vol. 111, no. 7, article no. 07D729, American Institute of Physics, Apr 2012.
The definitive version is available at https://doi.org/10.1063/1.3680246
Department(s)
Physics
Publication Status
Available Access
International Standard Serial Number (ISSN)
0021-8979
Document Type
Article - Conference proceedings
Document Version
Final Version
File Type
text
Language(s)
English
Rights
© 2024 American Institute of Physics, All rights reserved.
Publication Date
01 Apr 2012
Comments
Department of Science and Technology, Ministry of Science and Technology, India, Grant None