Title: Magneto-thermopower in the Weak Ferromagnetic Oxide CaRu0.8Sc0.2O3: An Experimental Test for the Kelvin Formula in a Magnetic Material,
Abstract: We have measured the resistivity, the thermopower, and the specific heat of
the weak ferromagnetic oxide CaRu0.8Sc0.2O3 in external magnetic fields up to
140 kOe below 80 K. We have observed that the thermopower Q is significantly
suppressed by magnetic fields at around the ferromagnetic transition
temperature of 30 K, and have further found that the magneto-thermopower
{\Delta}Q(H, T) = Q(H, T) - Q(0, T) is roughly proportional to the
magneto-entropy {\Delta}S(H, T) = S(H, T)-S(0, T).We discuss this relationship
between the two quantities in terms of the Kelvin formula, and find that the
observed {\Delta}Q is quantitatively consistent with the values expected from
the Kelvin formula, a possible physical meaning of which is discussed.