The Sign of Magneto-Thermoelectric Power of Magnetic Granular Alloys

Abstract

The thermoelectric power S and magneto-thermoelectric power δ S=S(H)-S(0) were measured for Fe--Cu and Fe--Ag granular alloys. The sign of both S and δ S of the measured samples was confirmed to be negative, similar to that of all the other granular alloys, contrary to the theories proposed hitherto. We point out the importance of the Kondo effect of the magnetic impurities between the magnetic and non-magnetic clusters, and we show we can understand successfully the sign of both S and δ S from this standpoint.