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http://dx.doi.org/10.3740/MRSK.2008.18.1.026

Low-Temperature Small Polaron Hopping Conduction in Bilayer La1.4(Sr0.2Ca1.4)Mn2O7 Ceramics  

Jung, Woo-Hwan (Department of Electronics, HoWon University)
Publication Information
Korean Journal of Materials Research / v.18, no.1, 2008 , pp. 26-31 More about this Journal
Abstract
The dc resistivity and thermoelectric power of bilayered perovskite $La_{1.4}(Sr_{0.2}Ca_{1.4})Mn_2O_7$ were measured as a function of the temperature. In the ferromagnetic phase, ${\rho}(T)$ was accurately predicted by $a_0+a_2T^2+a_{4.5}T^{4.5}$ with and without an applied field. At high temperatures, a significant difference between the activation energy deduced from the electrical resistivity and thermoelectric power, a characteristic of small polarons, was observed. All of the experimental data can be feasibly explained on the basis of the small polaron.
Keywords
electron-phonon interaction; hopping; jahn-teller effect; localization; small polaron;
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