Thermal and magnetotransport coefficients in doped SmMnO3 manganites

We present the results of a complex experimental study of the electron transport phenomena in doped manganites of the SmMnO3 system. The temperature dependences of the resistivity, thermopower, and Nernst coefficient were measured in different applied magnetic fields. Specific features of these dependences in different temperature ranges were revealed and discussed. Besides, all the studied transport coefficients demonstrate a similar behavior near the temperature of the magneto-ordered transition, Tc . The effects of the colossal magnetoresistance, colossal thermopower, and colossal Nernst coefficient were observed to be qualitatively analogous; all of them show a sharp rise at T ≈ Tc . It was also found that the value of the Nernst coefficient at temperatures below Tc depends strongly on the applied magnetic field thus demonstrating the anomalous behavior analogous to the one of the Hall coefficient.