The temperature-dependent thermopower S(T) of Bi0.5−xLaxSr0.5MnO3 (0.1≤x≤0.4) (BLSMO) has been investigated in this study. The density of state at the Fermi level as a function of the La concentration is obtained via the equation for the diffusion thermopower (TEP) in the low-temperature regime. An equation that takes into account the diffusion, phonon drag, and magnon drag contributions to the TEP was established. With this equation, each component of the TEP is extracted and compared in the intermediate temperature regime. It was determined that the phonon drag contribution of the TEP is closely related to the La concentration dependence of the lattice parameters and that the magnon drag component contributes predominantly to the thermopower of BLSMO in the intermediate temperature regime.
Alkaline-earth metal, Sr, was doped on multiwalled carbon nanotubes (MWNTs) by vapor phase reaction method. The tunneling electron microscopy, energy dispersive x ray, and Raman spectroscopy were studied for verifying the Sr doping on MWNT. The temperature-dependent resistivity [ρ(T)] and thermoelectric power [S(T)] were also performed for both pristine MWNT and Sr-doped MWNT (Sr-MWNT). ρ(T) of Sr-MWNT did not significantly change compared to pristine MWNT. However, S(T) of Sr-MWNT considerably changes, i.e., it shows n-type behavior in contrast to pristine MWNT.
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