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 ΔQ(H, T) = Q(H, T) - Q(0, T) is roughly proportional to the magneto-entropy ΔS(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 ΔQ is quantitatively consistent with the values expected from the Kelvin formula, a possible physical meaning of which is discussed.

11 pages, 6 figures

References in corpus (4)

• On the thermoelectricity of correlated electrons in the zero-temperature limit
• Origin of the large thermoelectric power in oxygen-variable RBaCo_{2}O_{5+x} (R=Gd, Nd)
• Enhancement of the thermoelectric power by electronic correlations in bad metals: a study of the Kelvin formula
• Non-uniform magnetic system driven by non-magnetic ion substitution in CaRu1-xScxO3:Two-component analysis

Cited by in corpus (1)

• Correlation in transport coefficients of hole-doped CuRhO${}_2$ single crystals