Abstract
The effects of Ru substitution at the Mn site for the manganite series of ${\mathrm{Pr}}_{0.5}{\mathrm{Sr}}_{0.5}{\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Ru}}_{x}{\mathrm{O}}_{3}$ $(0.0l~xl~0.1)$ have been studied using magnetothermoelectric power (TEP) along with resistivity and magnetization. Systematic changes of TEP were observed with variation of Ru concentration: suppression of the large negative peak at low temperatures, decrease of curvature with ${T}_{C}$ enhancement at intermediate temperatures, and increase of the value of TEP at high temperatures. These changes of TEP with Ru substitution and an applied magnetic field are analyzed in terms of broad-band metallic transport $(Tl170\mathrm{K}),$ magnon scattering processes $(170\mathrm{K}lTl{T}_{C}),$ and polaronic transport $(Tg{T}_{C}).$ From these results, it was found that the ferromagnetism is more strongly induced by Ru substitution than by an applied magnetic field, suggesting the important role of the Ru d orbitals in the charge transport of the ${\mathrm{Mn}}^{3+}\ensuremath{-}\mathrm{O}\ensuremath{-}{\mathrm{Mn}}^{4+}$ network.
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