Document Detail


Temperature dependence of phonon modes in nanocrystalline La0.67ca0.33MnO3 as observed by infrared spectroscopy.
MedLine Citation:
PMID:  19928246     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
Low temperature infrared absorption measurements have been carried out on nanocrystalline La0.67Ca0.33MnO3 powder across the magnetic and the insulator-to-metal phase transitions. Interesting changes are observed in the temperature dependence of the mid-IR polaronic background and the stretching mode of the MnO, octahedron. Upon cooling below 250 K, the overall absorbance increases, but, unlike in the case of microcrystalline LCMO, the stretching mode is not completely screened even at 5 K. The temperature dependence of the stretching mode parameters points to a much reduced phonon-polaron coupling as compared to that in the bulk material.
Authors:
T N Sairam; P Dey; G Mangamma; T K Nath; C S Sundar
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of nanoscience and nanotechnology     Volume:  9     ISSN:  1533-4880     ISO Abbreviation:  J Nanosci Nanotechnol     Publication Date:  2009 Sep 
Date Detail:
Created Date:  2009-11-20     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101088195     Medline TA:  J Nanosci Nanotechnol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5471-5     Citation Subset:  IM    
Affiliation:
Materials Science Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, TN, India.
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