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Titolo: Structural, microstructural and magnetic properties of (La1-xCax)MnO3 nanoparticles
Autori: 
Data di pubblicazione: 2013
Rivista: 
JOURNAL OF PHYSICS. CONDENSED MATTER  
Abstract: The crystal and magnetic structures of 10 and 20 nm sized (La1-xCax)MnO3 (x = 0.37, 0.50, 0.75) have been investigated between 5 and 300 K by means of Rietveld refinement of neutron powder diffraction data, coupled with transmission electron microscope observation and magnetization measurements. TEM observation reveals that nanoparticles are strongly affected by strain fields, probably originating from surface pressure. Irrespective of the composition, charge and orbital orderings are suppressed and F-z and C-y spin orderings coexist at low temperature; C-y and F-z orderings likely occur within the strained regions of the nanoparticles and in the matrix respectively. Moreover G(z) and A(z) orderings are sometimes observed, and are likely to be taking place at the border of the strained regions. RI Peddis, Davide/J-8556-2013
Handle: http://hdl.handle.net/11584/66568
Tipologia:1.1 Articolo in rivista

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