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Spin scattering effect on thermal transport and nonadiabatic small polaron hopping conduction in layered cobaltite thin film

Published online by Cambridge University Press:  11 February 2011

Shengli Huang ,
Xianfang Zhu ,
Keqing Ruan  and
Liezhao Cao
Shengli Huang*
Affiliation:
Department of Physics, Xiamen University, Xiamen, Fujian 361005, People’s Republic of China; and China-Australia Joint Laboratory for Functional Nanomaterials, Xiamen University, Xiamen, Fujian 361005, People’s Republic of China
Xianfang Zhu
Affiliation:
Department of Physics, Xiamen University, Xiamen, Fujian 361005, People’s Republic of China; and China-Australia Joint Laboratory for Functional Nanomaterials, Xiamen University, Xiamen, Fujian 361005, People’s Republic of China
Keqing Ruan
Affiliation:
Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
Liezhao Cao
Affiliation:
Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Transport properties in the a-b plane of Nd0.75Sr1.25CoO4 thin film as fabricated via a pulsed laser deposition technique have been investigated by means of measurements of resistivity and thermopower, respectively, in the temperature ranges of 76-300 and 80-310 K. The thermopower of the specimen revealed a mechanism of spin-dependent scattering of the charge carriers where its conduction could be well interpreted by the small polaron hopping conduction in the nonadiabatic regime at high temperatures and the two-dimensional variable range hopping of small polarons at low temperatures. Possible mechanisms for the polaronic conduction were also discussed in the article where several physical parameters of the specimen were determined using a small polaron hopping model and a better understanding of the strongly correlated electron system was achieved.

Keywords

FilmThermoelectricElectron-phonon Interactions
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 4 , 28 February 2011 , pp. 561 - 566
Copyright
Copyright © Materials Research Society 2011

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References

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