Analysis on insulator–metal transition in yttrium doped LSMO from electron density distribution

Yttrium doped LSMO (La 1 −  x Sr x MnO 3 ) was prepared using sol–gel technique and analysed for the insulator–metal transition from charge density variation in the unit cell with respect to different stoichiometric inclusion of yttrium. X-ray powder diffraction profiles of the samples were obtained...

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Bibliographic Details
Published in:Bulletin of materials science 2012-02, Vol.35 (1), p.107-118
Main Authors: ISRAEL, S, KUMAR, S SARAVANA, RENURETSON, R, SHEEBA, R A J R, SARAVANAN, R
Format: Article
Language:English
Subjects:
Charge
Charge density
Chemistry and Materials Science
Density distribution
Diffraction
Electron density
Engineering
Materials Science
Maximum entropy method
Rietveld method
Sol-gel processes
Strontium
Unit cell
X ray powder diffraction
Yttrium
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Summary:Yttrium doped LSMO (La 1 −  x Sr x MnO 3 ) was prepared using sol–gel technique and analysed for the insulator–metal transition from charge density variation in the unit cell with respect to different stoichiometric inclusion of yttrium. X-ray powder diffraction profiles of the samples were obtained and the well known Rietveld method and a versatile tool called maximum entropy method (MEM) were used for structural and profile refinement. The charge density in the unit cell was constructed using refined structure factors and was analysed. The charge ordering taking place in the insulator–metal transition was investigated and quantified. The insulator–metal transition was found to occur when 20% of La/Sr atoms were replaced by yttrium. The changes in the charge environment have also been analysed.
ISSN:0250-4707
0973-7669
DOI:10.1007/s12034-011-0264-4