Rare earth size dependence of Nernst thermopower in ferromagnetic perovskites: R0.6Sr0.4CoO3 (R = La, Pr, and Nd)

Here, we report the Nernst thermopower (Sxy)- generation of a dc electrical voltage transverse to the applied temperature gradient and magnetic field- in the ferromagnetic metallic oxide series: R0.6Sr0.4CoO3 for rare earth cations (R = La, Pr and Nd) of different ionic radii. Besides Sxy, longitudinal thermopower (Sxx) and resistivity in absence of an external magnetic field were also measured. In each of these samples, Sxy increases rapidly...