Panwar, Neeraj and Pandya, D. K. and Agarwal, S. K. (2008) Thermoelectric power studies on (1-x) Pr(2/3)Ba(1/3)MnO(3) plus xAg(2)O composites. Journal Of Physics: Condensed Matter, 20 (28). 285223-1-285223-4. ISSN 0953-8984
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Abstract
Thermoelectric power (TEP) measurements of Pr2/3Ba1/3MnO3+Ag2O composite manganites are reported here. A phase transition from metallic to insulating behaviour is observed for all the synthesized samples. No change in the TEP behaviour of the pristine sample Pr2/3Ba1/3MnO3 is observed with Ag2O addition. The phase transition temperature (TS~196 K) also does not change with Ag2O which indicates the presence of Ag at the grain boundaries. In the insulating region TEP is large and negative, while in the metallic region it is positive with small values. The observed crossover from hole- to electron-like transport is attributed to the excitation of the valence band electrons to the conduction band with increasing temperature. The metallic region is found to be governed by the electron–magnon scattering process whereas a non-adiabatic small polaron hopping model is found applicable in the insulating regime.
| Item Type: | Article |
|---|---|
| Subjects: | Applied Physics/Condensed Matter Physics |
| Divisions: | UNSPECIFIED |
| Depositing User: | Ms Neetu Chandra |
| Date Deposited: | 13 Apr 2017 08:32 |
| Last Modified: | 13 Apr 2017 08:32 |
| URI: | http://npl.csircentral.net/id/eprint/2102 |
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