Absolute thermoelectric power and resistivity of Cr-V and Cr-Mn alloys

The absolute thermoelectric power S and the electrical resistivity p of polycrystalline samples were determined between 80 degrees K and 580 degrees K for Cr-V alloys with up to 77 at. % V and between 300 degrees K and 750 degrees K for Cr-Mn alloys with up to 10 at. % Mn respectively. S of all alloys is positive. The resistivity and the thermopower are markedly affected by antiferromagnetic ordering. Both S and p have a maximum slightly below the Neel temperature, T-N, where S reaches values between 34 and 43 mu v/degrees K for alloys with 1 to 10 at. % Mn. These Mn alloys have S values between 20 and 24 mu v/degrees K above TN. The temperature gradient of the electrical resistivity in the paramagnetic state of both Cr-V and Cr Mn alloys is nearly composition independent. The large resistivity values for the alloy with lost. % Mn cannot be explained with a high density of states, because specific heat measurements on Cr Mn alloys between 100 degrees K and 625 degrees K yield only very low electronic specific heat values.