Sairam, T. N. ; Dey, P. ; Mangamma, G. ; Nath, T. K. ; Sundar, C. S. (2009) Temperature dependence of phonon modes in nanocrystalline La0.67Ca0.33MnO3 as observed by infrared spectroscopy Journal of Nanoscience and Nanotechnology, 9 (9). pp. 5471-5475. ISSN 1533-4880
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Official URL: http://www.ingentaconnect.com/content/asp/jnn/2009...
Related URL: http://dx.doi.org/10.1166/jnn.2009.1167
Abstract
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 MnO6 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.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Scientific Publishers. |
| Keywords: | Manganites; Nanoparticles; Infrared Spectroscopy; Phonons; Polarons |
| ID Code: | 53216 |
| Deposited On: | 05 Aug 2011 10:38 |
| Last Modified: | 05 Aug 2011 10:38 |
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