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Research Article | Open Access

Role of phonon drag and carrier diffusion in thermoelectric power of polycrystalline La0.97Na0.03MnO3 manganites

Dinesh VARSHNEY( ), Dinesh CHOUDHARY
Materials Science Laboratory, School of Physics, Vigyan Bhawan, Devi Ahilya University, Khandwa Road Campus, Indore 452001, India
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Abstract

We develop a theoretical model for quantitative analysis of temperature-dependent thermoelectric power of monovalent (Na) doped La0.97Na0.03MnO3 manganites. In the ferromagnetic regime, we have evaluated the phonon thermoelectric power by incorporating the scattering of phonons with impurities, grain boundaries, charge carriers and phonons. In doing so, we use the Mott expression to compute the carrier (hole) diffusion thermoelectric power ( Scdiff) using Fermi energy as carrier (hole)-free parameter, and Scdiff shows linear temperature dependence and phonon drag Sphdrag increases exponentially with temperature which is an artifact of various operating scattering mechanisms. It is also shown that for phonons the scattering and transport cross-sections are proportional to ω4 in the Rayleigh regime where ω is the frequency of the phonons. Numerical analysis of thermoelectric power from the present model shows similar results as those revealed from experiments.

Keywords

phonon dragcarrier diffusionthermoelectric power

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Journal of Advanced Ceramics
Volume 3 Issue 3,
September 2014
Pages 224-229
DOI: 10.1007/s40145-014-0113-1
Cite this article:
VARSHNEY D, CHOUDHARY D. Role of phonon drag and carrier diffusion in thermoelectric power of polycrystalline La0.97Na0.03MnO3 manganites. Journal of Advanced Ceramics, 2014, 3(3): 224-229. https://doi.org/10.1007/s40145-014-0113-1

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Received: 04 April 2014
Revised: 09 June 2014
Accepted: 14 June 2014
Published: 02 September 2014
© The author(s) 2014

Open Access: This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.
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