Thermal transport properties of MgB₂

The thermal transport properties and magnetic susceptibility of MgB₂ have been studied. The thermoelectric power with a positive sign shows a nearly T-linear increase up to ∼150 K but shows a saturated behavior at higher temperatures, which suggests the existence of two types of charge carrier. The magnetic susceptibility above T_c shows a Pauli paramagnetism but shows a substantial T dependence which should include the information of the band structure of MgB₂. The thermal conductivity shows a suppression below T_c without a clear anomaly at T_c which is a result of the reduction of the normal charge carrier concentration below T_c.