Two fluids formation in the normal state of high-TC superconductor -: High temperature thermopower of La2-xSrxCuO4

Thermoelectric power (TEP) of high-T-C superconductors has been investigated in a wide range of temperature (T-C < T < 700 K) for La2-xSrCuO4. For wide doping level from underdoping to heavily overdoping, TEP follows the linear-T dependence above the broad peak temperature, T-p. At high temperatures, however, TEP shows deviation from the linear-T dependence at a certain temperature T-h, which is consistent with the pseudogap temperature. The systematic change of the TEP behavior is discussed in terms of the two fluids model of bound pairs and independent normal carriers.