Magnetothermal transport properties of granular Co-Ag solids

Abstract

Thermal conductivity and thermoelectric power have been measured between 2 K and 300 K on granular ${\mathrm{Co}}_{20}$${\mathrm{Ag}}_{80}$ solids. As in ordinary metals, thermal conductivity is largely dominated by the electronic contribution. The Wiedemann-Franz law is found to be satisfied over the whole temperature range investigated, which is mainly ascribed to dominant large-angle elastic scattering processes. Giant magnetothermal conductivity has been observed in accordance with the giant magnetoresistance effect. The magnetothermoelectric power is negative and increases with temperature.