Large Thermopower in Metallic Oxides: Misfit Cobaltites and Mangano-Ruthenates

Simple item page
dc.creatorHebert, Sylvie
dc.creatorMartin, Christine
dc.creatorMaignan, Antoine
dc.creatorFresard, Raymond
dc.creatorHejtmanek, Jiri
dc.creatorRaveau, Bernard
dc.date2001-10-12
dc.date.accessioned2026-07-07T02:43:09Z
dc.date.available2026-07-07T02:43:09Z
dc.descriptionTwo different kinds of metal transition oxides have been studied for their large thermopower values. The first one corresponds to the Tl-based misfit cobaltite which is a hole-doped metal. We demonstrate that the partial Bi-substitution for Tl in this phase induces an increase of the room temperature (RT) thermopower (TEP) value. Same result is obtained with the new Pb_{1/3}SrCoO_{3+delta} misfit corresponding to the Tl complete replacement by lead. Simultaneously, the T dependence of their resistivity exhibits a re-entrance below 70-90K where a large negative magnetoresistance is observed. Magnetic measurements reveal a strong interplay between spins and charges for this class of materials. Electron-doped (n-type) perovskite manganites are a second class of potential candidates for applications. In particular, the Ru^{4+/5+} substitution for Mn in the CaMnO_3 semi-conductor induces a drastic drop of the resistivity values. Metals with large RT TEP values and not too large thermal conductivities are generated. A comparison with best known materials, Bi_2Te_3 and NaCo_2O_4 is made.
dc.description8 pages, 13 figures, Proc. of the 6th European Workshop on Thermoelectrics (Freiburg 2001)
dc.identifierhttps://arxiv.org/abs/cond-mat/0110270
dc.identifierhttp://arxiv.org/abs/cond-mat/0110270
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/18380
dc.subjectStrongly Correlated Electrons
dc.titleLarge Thermopower in Metallic Oxides: Misfit Cobaltites and Mangano-Ruthenates
dc.typetext

Files

Collections

arXiv