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http://dx.doi.org/10.3740/MRSK.2014.24.11.604

Low-Temperature Electron Transport Properties of La2/3+xTiO3-δ (x = 0, 0.13)  

Jung, Woo-Hwan (Division of Electrical Engineering, Howon University)
Publication Information
Korean Journal of Materials Research / v.24, no.11, 2014 , pp. 604-609 More about this Journal
Abstract
The thermoelectric power and dc conductivity of $La_{2/3+x}TiO_{3-{\delta}}$ (x = 0, 0.13) were investigated. The thermoelectric power was negative between 80K and 300K. The measured thermoelectric power of x = 0.13 increased linearly with increased temperatures and was represented by $S_0+BT$. The x = 0 sample exhibited insulating behavior, while the x = 0.13 sample showed metallic behavior. The electric resistivity of x = 0.13 had a linear temperature dependence at high temperatures and a T3/2 dependence below about 100K. On the other hand, the electric resistivity of x = 0 has a linear relation between $ln{\rho}/T$ and 1/T in the range of 200 to 300K, and the activation energy for small polaron hopping was 0.23 eV. The temperature dependence of thermoelectric power and the resistivity of x = 0 suggests that the charge carriers responsible for conduction are strongly localized. This temperature dependence indicates that the charge carrier (x = 0) is an adiabatic small polaron. These experimental results are interpreted in terms of spin (x = 0.13) and small polaron (x = 0) hopping of almost localized Ti 3d electrons.
Keywords
electron-phonon interaction; hopping; small-polaron; spin-polaron; thermoelectric power;
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